Ok, so here's the thing. You will not have the time you need to do both at their maximum potential. Doesn't matter whether you got insane time management. If you have a typical 12-15 credit course load, and plan on streaming 6+ hours a day you are going to have the sacrifice the quality of both your education and stream to do both properly.
Personally, I have three streams a week at about 2-3 hours each. This leaves just enough time to attend class, do all my HW, cook, and have an hour off to not get burnt out. My biggest advice to you would be consistancy. I have about 3 or 4 people that tune in to EVERY stream because of this consistancy (sometimes you miss a day but that's fine. Just be as consistent as humanly possible).
At the end of the day, college trumps twitch for 99.99% of people. You are investing money into yourself and your life. Cut down on streaming if it effects your degree. However- just start streaming now. You will figure out a lot as you go along especially how much you can/should stream. Do not lie to yourself if you are sacrificing grades for views. Its not worth it.
Sorry for the long post, but if you have specific questions feel free to pm/ask I'll respond after class.