Of Buying a Masternode and run it on a Vps
What kind of masternode could you possibly run for $1000? None that I know of, and if there are any coins that let you run one for that little money, it's not worth it. But I'm pretty sure there aren't any.
A mining rig is probably to expensive, also the powercosts in my country are not that great so not really a option I think.
I wouldn't bother trying to mine anything if all you've got is a grand to spend. You'll never make a profit, so don't try it. You could buy $1000 worth of a pos coin and stake it, but you aren't going to make much money. You would be better off just buying some bitcoin and holding it.
Create my own T-shirt Company
Ooookay. If you can do that with the money you say you have, that's probably the best idea tho I don't know why you're even considering an investment in crypto if you're thinking of starting a tshirt company.