As you've already mentioned that you're not intending to bounce out school, I'll just shut up about the pros and cons of that. You've already made the right choice on that one.
The career thing can be as lucrative as you want to make it. I'll be real though...1 in 80 jobs you do for clients will actually be as fun as something you make for NG, on your own time. Most of the people with the money are interested in slideshows of handshakes, compasses, chess pieces, and other smarmy business memes. Sad, but true. Also, startups are a little more scarce these days than they used to be. Thank the economy for that one.
My advice, in a nutshell, is to carefully pick the Flash job you want. If you don't, Tad and Biff will headhunt you, and you'll make be making XML galleries of their sleepy powerpoint presentations forever. May the force Bwith U.