FBA Product owner looking for partnership

so basically I am a brand owner, and I recently have my listings(8 products) up on amazon , on a niche that is not widely being used, I am totally new to amazon ads and the world of marketing, and was looking for a company or some people that will maybe take control entirely of the marketing and everything as partners, where we will make a deal by fair percentages and everything would be also legally done, are there any marketing companies or people like that?
thanks