Welcome to Option 2 of finding a costume to promote in the costume website market. If you’re looking for option 1, it’s here. I consider this the backwards way to finding niches, although it works pretty well. Usually I end up adding a few websites to my Go Daddy domain purchases because I’ve stumbled across them this way.
I know I shouldn’t assume, but for this article, I’m assuming you’ve read at least the beginning of option 1. You should know about BuyCostumes and why I use that website, and you should be at least vaguely familiar with the Google Keyword Tool. If this makes no sense, I suggest you go read option 1, at least the first few paragraphs.