The only tools you need for bowls is a bowl gouge. I'd suggest a 3/8" bowl gouge to get started. There are other tools that people use such as scrapers, but for the most part, a bowl gouge is all you really need.
There are many good bowl gouges available and I already have a few of them, but if I were starting from scratch, i'd check out http://www.thompsonlathetools.com/ and buy a gouge from them. I don't think he sells them with handles, but I prefer to make my own handles anyway, and he has good instructions on his site for making handles too.