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DavidTo test the market and find sellers you can trust, buy relatively inexpensive things for a while. You're going to make a mistake or two (We all have), but, on a $5 or $15 item, it can be considered an inexpensive lesson. The biggest horror stories involve novices who's first purchanse is a Babe Ruth Autographed baseball or 52 Topps Mickey Mantle (Let me tell you a story about a man named Koos).
As said before, post questions on this board when you need to.