Don't concern yourself with advertising or sponsors until you've built yourself up to a decent size. At that point, your visitors will start approaching you asking about sponsorships.
I can't really give you a set figure because it differs by industry, and I'm unfamiliar with most industries other than my own.
How much do you pay in web hosting? You might want to set up a PayPal donations type thing saying that you're accepting donations in exchange for web hosting, so that you can break even.
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The Queen of DaniWeb
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