Hi,
Welcome to TWF.
You can start by selling something you like or have a lot of knowledge about.
Your profits can start very low, but slowly you will improve
I think you can start using Ebay to sell for starters too as a side platform while your selling on your cart too.
I do sell Branded Clothings from suppliers on this forum, you should take a look around the marketplace.
Last of all, i wish you the best of luck and hope your wife recovers soon
Cheers