Hey guys,
I'm not really the best at making guides but I've been all over this site and have loved some of the guides I've read, so here is some info of my own.
If you are just starting off on the AH or you need to tell a friend how to start, instead of focusing on the rare items to be sold on the AH keep an eye on your town's ring/amulet vendor. If you happen to see him pop up with a +DMG and %IAS, +DMG and +STAT, or even just a +DMG ring or amulet, pick up quite a bit of them. They generally only cost a couple thousand gold to buy from the vendor and after i played with the AH a bit I found you can easily sell them fast for 70+k gold for even the lvl 30ish ones. The higher level ones (lvl 50-60) ones can sell for quite a bit more.
I know this isn't really info that is going to make you a billionaire but it definitely helps out when your starting. They sell out quite fast and are easy to obtain.
Try it out guys! Just a nice way to make a mil or two in a short while.