For vegging you want more blue light, get yourself a small metal halide or some compact fluorescent in the 6500k range.
For flowering you want more redish light, get yourself a high pressure sodium lamp + reflector and ballast. You can also use compact fluoescents for flowering but the final yeild won't be as great. If you do choose to go with cfl's for flowering get them in the 2700k range and get lots of them.
Also you might want to have a look at some grow journals here, and do what mogie suggested and go through the FAQ's.