I agree with the above comments. If you are going to try to make money from your website, it NEEDS to have it's own domain & own email address. It's just the professional thing to do.

Yellow & green text on a black background? OMG that is hard to read. Have you tried printing that page? I would reccomend sticking to light colored background and black/dark text.

It's very difficult to navigate that page as well. All the text & links just run together.

As far as how much to sell advertising space for I found this link, but it's aimed at blogs, though it should give you a good overview: How Much Should I Charge for my Advertising Space?

And here's another one MarketingProfs Knowledge Exchange : Selling ad space on a niche web site

Before charging for ad space, you need to know who your website caters to and what kind of traffic you have.