Do you look at the page text to see what ads fit the page (which I believe AdSense does)? I'm asking because I just signed up and it seemed like the ads I saw on my site were completely random:

Top Rated Hybrids, Dividend Income Funds, Best Tablets, Best Cars, Best Stocks To Buy, and Luxury SUVs.

Is there a way for me to indicate which category my site is in?

I also got ads with ugly green buttons. Is there a way for me to prevent this ad scheme?

Also, is there any way for me to change the color of the links?

Thanks!