Sign up with them for minimum US$50. Each account has a $20 minimum monthly spend. There is a minimum bid requirement of $0.05 per click-through. Once you sign up, take a pen & pencil, read tips & tricks & requirement for listing given by overture expert. Prepare listing for your web site. Their checking process is manual, each & every listing submitted by advertisers is approved by overture editor, they want quality listing & they are very strict on selecting listings. Here are few restrictions on number of words for keywords, title & description. They take five days for approval of listing.