1. Can I use any ad size?
2. Can I put the ads anywhere I want on the site (Right hand side for example).
3. If I use one size ad on the page (120x90 for example) can I have a larger ad on the vendors page?
4. If I show all my advertisers along the right hand side can I control the order they show up?

I'm sure I'll come up with more questions.. these were just a few to get me started. Thanks.