For new startups, an SEO budget typically falls in the range of £500 to £5,000 per month, depending on factors such as the industry, competition, and the scope of services needed.

Depends on your industry and target customer. As a no-revenue start-up I would not spend more than $ 1,000. If it is a consumer direct item then I would put most of my marketing money into ppc ads and still less than $ 1,000 for SEO.