If you have sold something successfully on Ebay, can you help me get started?

I have some used stuff that should still have some residual value as well as some brand new items still in original boxes that I decided I don’t need (yes, embarrassing!). I am in full declutter mode at my house.

I would like to sell these online, but I don’t like craigslist, and would like to try Ebay, but have no idea how to get started. I’ve set up a PayPal account. What’s next? Help?

Also, have you tried any of the alternatives such as Close5 or OfferUp?