If you have never used Ebay sell some stuff from around the house or $0.99 cent ebooks to build up feedback. Some further:
Find a shirt supplier in your and make designs related to current trends. If you have the money to dropship this is a classic/easy method. Even if you don't sell a lot you'll make extra money you could put towards other stuff. I have made good money doing this. Try around 10 shirts at first to test.
I have also dropshipped from Aliexpress, but is risky. Package take long time even with epacket sometimes. To do this must find good supplier. But profit margin can be high because wholesale shit is so cheap.
I also have my own products I just ship myself or list on classifieds. I got these wholesale from aliexpress and dhgate. If you do the right research and pricing you can spend $50-$100 on wholesale products and make huge return. Certain products I have I buy for $3 and sell for $20, etc. Small items will build up.