Answer:
First start simple especially if you don't have anyone working for you yet, sell to family and some friends. Next you want to start out selling to family and friends like I said before, if you start to big you wont be able to supply the demand, I call this the suppliers flow, know how much you are making and how much you can sell your merchandise for . Then be able to make a profit off your clothing, you wont make any money if you sell them for how much you make them for. Social media is a great starter, websites are more for production lines but its your call. You can buy a printer if you want but if not you can probably find someone that knows how to print shirts.
Explanation:
I hope this helps, and good luck selling I hope you enjoy production as it is very fun once you get big and selling a lot.
Some problems that might occur is that you might forget some schedules, cause there is going to be several schedules, or you might forget something, etc.
Well you see Pepy is a loser
I'm not going to write 50 words, but historical context is always important so you can use examples.