Ok, let me explain it a little better. A free flight is a small glider-like plane that has a small engine with a very limited amount of fuel. Basically, they go straight up until the fuel runs out. Then, they are trimmed so the they just fly around in a big circle until they land, or in some cases, they have a built in timer that will flip the tail up to make the plane just stop flying and float straight down. There's a picture attached showing a typical free flight model.

As far as which club to join, I can't say seeing as how I don't know any of the clubs in your area, but here's the best thing to do... Go to your local hobby shop. Go to several if you have more than one and find out which one(s) specialize in R/C airplanes. Then ask them where the local R/C club flies, or you may find that there are more than one. As far as which one is the best, that's like asking which is better, Ford or Chevy. The one that's best for you, is the one YOU like best. The only way to find out is to go out to their field and meet them.