Niche down to help a certain kind of client. Find out what serious problems you solve for them with your solutions. Don't talk about SEO or web design: you'll turn yourself into a commodity if you do. See this: https://www.jasonkanigan.org/what-to-do-if-you-are-a-commodity/
Can you explain a bit more about what you are doing? There are a number of established ad servers, but I am unclear on how you are going to work with them to provide a service that is not already provided.
Well done! You now realize that it is not the idea alone that matters. Too many would-be entrepreneurs miss this understanding. Marketing is an art when done correctly. It must be rooted in the 4Ps as we say, but it MUST be uniquely inspired by the goods and/or services that need to be "Crossin...
Start by interviewing people who do have experience in the field and determining to what extent they feel the pain for the problem you're solving. Your biggest risk with an idea where you don't have domain expertise in is that you're solving a problem that doesn't need solving. If after speakin...