Ebay and Online Stores

I've been buying items on Ebay for a few years. This week was the first time I sold something.  It was quite the learning experience and now I'm glad a did it.  I got a rush when I saw that my item sold. (And I almost put it in my thrift store donation pile).  I'm glad that I made a little extra income and now I'm trying to figure out what else I can sell!  Do you have any tips for selling on Ebay?  My next goal is to sell homemade items on Etsy.