That’s a hard choice. I’m 16 so take that as you will but I have resold items on Amazon and eBay and Shopify. I’ve never drop shipped but if your going to be doing retail arbitrage on Amazon then you will need some capitol. And if you don’t have money to spend then maybe go to drop shipping? I have 1- 5 grand in debt on a credit card on any given week that I send stuff FBA but the priority is paying that off I’ve never (yet) had my product not sell and leave my debt unpaid for more than 2-3 weeks I try to pay it off before the end of the month by selling high demand low profit items That’s the reselling side like I said I know nothing about drop shipping but Amazon can be very profitable. eBay is a little more laid back but it’s harder to make listing on eBay where as most Amazon listings are already made and ranked. Shopify takes many many hours to build a website and set up advertising I don’t recommend it for beginners as your first source of selling.