One thing I've found is that potential customers can visualize hypothetical products nicely, and can be quite responsive, especially if you are solving a pain point for them. So, for example, you're already underway with your project, but I'd scale that mental impression back in any sales pitch. Call producers/product advertisers and describe what your potential product (now nothing more than an ambitious idea) could be like and ask their advice for further tailoring it to them. This allows them to see their benefit, and past your real world start up difficulties. Next, ask if you may contact them once you've got something solid going. Do this with both sides. Build up a list of contacts over a month or so, then tell everyone how many people you've got interested and that you're opening the initial sign-up page now! :)

Edit: Also, your homepage looks great, but I'd take off any solicitation for ads for yourself. I know that's what you get out of it, but you don't want to do anything which might scare away those first crucial users. One step at a time. :)