If you intend reselling items sourced from a distributer, especially then re-selling them for about $100 each I doubt if you would be able to compete on price with Chinese sellers and drop shippers who deal in hundreds if not thousands of the same items and can sell them with a profit margin of as little as a few cents each and also include free postage.

Treat it as a hobby and if you are lucky enough to find something new that no-one else sells but everyone wants to buy then consider opening a store.