Complete sets of cards from the early 90's, baseball, football, hockey. Also have large sets of trading cards from the Terminator 2 movie, G.I. Joe cards, Garbage Pail Kids, etc. Most of the them are from 91'-94' and many appear to be complete sets (500-700 cards per set). I've never collected cards of any kind before. Can these be of any value? Would it be worth my time to have them appraised? Anything I should know that I'm NOT asking? Thank you!