Well, the obvious answer is Delaware, USA. It's very inexpensive there to incorporate, and state taxes and fees are very low.

If you've created a "perfect pitch" you should not be having any problems.
Have you tried crowdfunding platforms like "Kickstarter"? If your pitch is so good, you will attract a lot of smaller investors... and maybe even land a big fish or two.
SEND ME YOUR PITCH... and I will see if it is as good as you think!

Let's talk! I might be able to help. It all depends on what you are selling and to whom you want to sell! (First call is gratis, of course!)

It is completely understandable that coaches focus on their credentials and telling about themselves on the homepage. Potential clients want to have some sense of security.
Yet credentials don't tell the whole story. It is not hard to get credentials. And coaches can say anything about themselves that they want.
On the other hand, many coaches out there have a wealth of experience and learning, but don't have the credentials.
My tip to coaches: encourage an initial, free conversation. Speak about your own personal experiences and how your life experiences relate to what you are coaching.
My tip to clients: contact coaches and speak with them.
be open with them. See if they can answer your questions and speak to your personal needs.
If you want to learn more, contact me!

I am expereinced with many kinds of sales situations and know that HOW you deliver the message is often more important than what the message is.
As far as details go, the answer depends to a degree on what kind of product or service you are selling, at what price level (2 figures or 7?) and how (personal sales pitch, telephone, text).
Here are some general remarks first regarding pitches.
1) Address the customer's situation - whether his business or personal situation. Show him that you "get" him and can speak his language.
2) Convince him of your expertise - he needs to know that you know what you are talking about.
3) Show him: a) Why he should buy now, b) What's in it for him and c) Why you/your product is the best choice.
4) Show him what your commitment to him is.
5) Tell him how he should make a decision.
6) Stick to your guns - you have something of value and you are not willing to do everything and anything to make the sale.
If you are actually speaking to your prospect, there are a number of techniques you can apply to most situations.
1) Listen to him carefully and identify words he uses that have meaning to him so that you can...
2) Repeat these words back to him exactly, in the exact order if possible. This is called "Pacing".
3) Mirror his body language whenever you can - not immediately or exactly, but close enough. This is called "Mirroring"
With pacing and mirroring you give him the subconscious imperssion taht you "get" him and that you are alike.
4) Greet him with a genuine smile and smile whenever the situation allows. Smiles elicit smiles, and smiling causes a feeling of happiness.
5) Maintain good eye contact. Comfortable eye contact, but contact that is more frequent and is held longer than people normally do.
This communicates confidence, honesty and genuine interest in him.
6) When not mirroring, maintain open, relaxed body language.
NLP (neurolinguistic programming) offers other related techniques.
I've just scratched the surface!
Interested? Then contact me!

As a freelancer myself, I can tell you what keeps most freelancers loyal and honest.
First of all, determine which freelancers are providing you with value, then...
Provide value yourself.
1) Pay them well - maybe increase their rate
2) Provide them with as much work as possible
3) Explore with them other task areas in which they can also contribute and earn.
4) Offer other perks, if possible (visits to your HQ, free courses that can expand their areas of work, etc.)
In other words, give them long-term prospects!
Want to talk with me? Give me a call!
https://clarity.fm/duanemarch

The short answer is:
1) Your product needs to demonstrate a clear appeal to consumers, including the fear factor ("If you don't use this...")
2) This will also affect product pricing.
3) You have to show the science behind it, what is proven and what is new.
4) If required, you should already have the necessary approvals (FDA, etc.)
* Above all, you need to demonstrate that you know the market (present and what's coming) and the industry, and that you know what you're doing.
This is, I can only imagine, a big money deal. Do not skimp on preparation or research.
There are options as well. A "simple" deal where these stores act as wholesalers or some sort of partnership / profit share.
Let's talk about what you are offering!
https://clarity.fm/duanemarch

Well, I know a lot about promoting language courses with business clients in mind!
The answer to your question is: Yes, businesses would benefit!
That, however, is just the beginning.
1) Your content has to be professional and offer something most language course providers don't offer (USP).
2) You target groupd seems clear - companies wanting to do business with the Spanish-speaking world - but you need to identify those companies. You need to do research here and network. LinkedIn is an obvious choice, but you want to filter effectively. For that, try out LinkedIn navigator or other add-on services (which you must pay for). There are, of course, also groups there that could be relevant.
3) You need to get people to know who you are and what you are offering (that's obvious).
There are a number of course platforms - like udemy and Teachable - where you can test your course(s) and even make some money in the process.
You can also post videos that provide an example of your course.
Give me a call. I can share my experiences with you!

If you can't get traction, one reason is your app is not getting exposure, is not attracting Germans who would be interested.
I have struggled in the German market as well. Germans are a bit less excitable and a bit more skeptical.
I would suggest thinking about the following:
1) the app name can be English - no problem - but advertizing and descriptions need to be in good German.
2) Find someone wiht fluent German who is active in social media. Create a Facebook group and page for German speaking FB users. Provide, if possible, a demo.
3) German language YouTube video!
4) A network comparable to LinkedIn but dominated by German users is XING. You can join approriate groups there.
5) Of course, if you're willing to spend some money, FB ads are good, but you want to know how to define the right target groups.
One thing that could help with all of this is to find a German speaking app enthusiast who can help you promote using all the suggestions above.