rpm vs speed

good morning. I am new to the atv world. I just got a new 2015 rzr 900 s. only have about 3 hours on it. have a couple of questions.
1. can someone tell me about rpms and associated speeds in both L and H gears. how many rpms should I be pulling for the associated speeds? being new, seems like pretty high rpms for speed that I am showing.
2. my rzr is street legal for az. seems like I am in awd all the time even when put in 2wd. did the manual instructions for backing up 10 ft. stopping and then putting in L to unlock the front. my awd light stays on on the dash but the icon doesn’t show up on the instrument cluster??
just want to make sure I am not doing something wrong.
had lots of experience in the past with racing cars on the tracks but this is a new experience. any help/assistance would be greatly appreciated.
thanks