Know-How Exchange : Advertising/PR

I am a young high school student with a great concept for an educational / young entrepreneur type of web page. Unfortunately, I'll need to pay to hang the site and that costs $$. Yes, I must pay bc my core content involves about 28 sub-web pages that will draw my core audience (science nerds). Although I'd love a "real income" eventually, my primary goal is to get the site to pay for the expenses and then tweak and the site with bells and whistles. A couple of fun second tier projects I've considered: a fun interactive patent / invention game page and a research team page (teams combined by taking surveys and analysis I develop to create academically gifted "dream teams"). Anyhow. How much $$ can I earn with, say, 500 - 1000 unique visits per week? I need traffic goals and I'm not really selling anything yet.