@Emma S. Along with what @Jon Lee said, you almost don't even need a buyer's list if you have the deals. One or two big players will probably take most of what you can find, even as you start getting larger numbers. Just be sure those deals are in areas that they're interested in. Of course, I'm going entirely on secondhand knowledge here. I haven't wholesaled anything myself, so 'grain of salt' and all.
@Jay Hinrichs, you always seem to have a useful perspective. I'm considering getting my license, mostly to get out of my corporate job and take a position that will help me learn and develop a network in real estate. It doesn't hurt that my state seems to almost require it for wholesaling. The only ways I know to get around having a license are assignments and double-closings (which seem to have a really negative connotation for most investors), or simply closing on the property yourself before selling. While the latter is probably the truest form of wholesaling, it does miss some of the benefit us newbies look for in entering the arena without much starting capital.