Just remember in a freeroll that you may be playing serious poker trying to build your bankroll, however the donks and fish are playing to play. It can get frustrating quickly. I would recommend a small deposit and play the 6 man sit and go tables for a slow build, if you are serious about building a nice roll. Every once and a while play a higher stakes table. Test the waters. You will find the challenge much more satifying than the freeroll route