Just sign up for eBay and Paypal and put up an auction. Does not take much more than that to get started. You can add a storefront and optimize your marketing on eBay after that. First thing is to see if you can sell one item and then grow from there.
I sold quite a few things on ebay. I was selling stuff from drop shippers especially electronics but it wasn't very profitable. Too much time little profits. I also sold some of my old VHS tapes and books I didn't need anymore.
i sell pharmaceutical rep pens what i do is i call doctor offies, and offer to buy them, or i ask my uncles/aunts to sell them to me i sell them on ebay and make around $2-$3 each easy $15 a week