I've had my son all over central Florida and the best by far is St. Pete on Monday nights with Vince DeVane and JB Ballard ($25). Or come to Lakeland for 1 on 1 with Vince for $50 an hour, sometimes he and JB have a weekend clinic for $250.
I inquired about training at Bithlo awhile back and they e-mailed me saying they no longer had schools on Sat.
At Dade City Randy is very very good at building the foundation. You'll run the tires and go over your 3 body positions, this is the most important part!! You do get to go out on the main track for a "free ride" but all learning is on the tires with Randy. Once you move to the next level there's a couple different instructors. Unfortunately the one my son has (Intermediate or mini's) isn't very hands on with the kids. He just let's them ride around carrying on bad habits and not much encouragement. A lot of locals pay the $25 for practice time for the evenings race.