Welcome, Pete, to our forum may you find it both enjoyable and informative. IMHO, this is an excellent forum for a new guy. You may want to hang out on the NFHS site, as there you'll be seeing posts for other guys working high school and middle school games. I ,too, am a baseball umpire and your officiating psyche from there will prove helpful. IMHO, baseball calls are 80%=+ objective (fair/foul,out/safe,ball/strike) where in football probably -50% are objective (catch/no catch, inbounds/OOB,marking forward progress). The subjective calls are the hardest to master (PI or no,holding or no,etc) and often will determine the better official. Good luck, Pete, and remember -our game has a clock - it will give you a general idea as to when you can be home - no one hour innings!!!
-Ralph