Yes, you can also enter your "real job" the same way you always do. In your real job are you an employee (W-2) or a contractor (1099-MISC)? If you get a W-2, just enter it under Wages and Salaries, the same as you would without the Twitch income. If you get a 1099-MISC for your real job, or no form at all, that's also business income. Unless the real job is also streaming, you should enter them as two separate businesses.
