Start up depends on what you want to start with, best thing to do depends on your capital.
There are a lot of different options, and they're all very very budget dependent. If you are sure you want to start a t-shirt company, figure out the amount of money you can put into it, then from there you can work out the best company you can start with that money.
You can start with as little as a few hundred dollars, though obviously that'll be a rather different company to the one you'd have with $30,000+
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