You will probably realize the first 100 coins you find interesting are common things that happen to coins. When you see more and more coins, then you will spot what to look for.

Take a look at the videos in my signature line below. They are a 5 part series entitled: "Coin Fishin." Many have viewed this have enjoy this. The whole length is 2.5 hours. So take it in segments. It covers coin fishin' while searching what to keep and what to throw back. A few coin you will see, you've probably never seen before and a lot of coins on different subjects. Take a look when you get a chance.