Focus on finishing your PPL and getting your instrument rating. Then focus on building some time and knocking out your commercial. While you are doing this try to learn as much as you possibly can about everything from flying the plane to the book knowledge to the FAR's. Make getting your CFI more about learning to instruct a student and less about trying to learn all that stuff you should have learned during your PPL, Instrument, and Commercial training. Try to not to get in the box checking mentality and rather learn it because you want to learn it.

But to answer your question having a CFI job and going to college full time sounds like it would be a piece of cake to me. I fly full time in the Air Force, but CFI on the side to keep my foot in the door with civilian aviation, build hours, and enjoy teaching guys like you to slow down and focus on learning everything you possibly can while you can.