eBay as a Seller

I'm not new to eBay. I'm familiar with it like everyone else. I've bought from them before. The thing is that I'm new to selling. Yes, I started selling on eBay a few months ago and so far, I've sold six things already. I figured that everyone does it to earn some extra cash, so what the heck, let me join in on all of this. It's been a trial-and-error thing for me so far, but I'm getting the hang of it.