You ask an interesting question. AI is a broad field. Are you planning to specialize or generalize your content? In a world where traditional subscription-based media struggles to stay afloat, you are choosing a risky option to deliver content.
I have been in magazine and book publishing for 30 years. Lots has changed in those decades. I have switched to online course creation as an alternative to traditional media. There is a strong trend toward online courses. It is possible to create a valuable newsletter for a target audience. Start by tightly defining your ideal subscriber. You must know who you are creating content for and why. You must be confident you can create highly relevant and useful content unavailable to access freely. What are the benefits to the reader? Use the Minimum Viable Product concept to begin your process. You don't want to invest any more than necessary for an unproven product launch. Consider using the Ask Method to help you determine the viability of the product. Marketing the product is like any other launch. You need visibility and authority. Guest blogging, and media coverage are recommended. Create a website or blog with detailed, authoritative content you can work to get high SERP rankings. Podcasting is another way to build an audience. Researching for audience interest and competitive analysis are also strongly recommended before you launch. Feel free to set up a time for a follow up call via Clarity.