After learning a little more about this art form I decided to go collect a sapling from behind my house. I didnt know what I was looking for in a possible bonsai
In a possible bonsai you are looking for good nebari - a good root flare with nicely placed, tapering roots, a fat and tapering trunk, proper branch placement with tapering branches that are ramified into secundairy and tertiary branches. You will be looking for a tree that looks like it has battled the elements for ages and has survived, showing the signs of that struggle and giving an impression of a high age and maturity.
Indeed these all are characteristics you will not find in a sapling and the question makes no sense whatsoever.