I am struggling to follow what is being asked here, you have an advertising idea you want to sell to advertisers?

New ideas are always a hard sell then you have people who look at it produce it and run with it, without crediting you with what is due. If it is an idea that can be easily copied then it is a problem.

I would suggest getting a mentor to go over it with you.

But I could be completely wrong so if you can give us more detail maybe we can give feedback