If you are serious about this, and, by that, I mean serious about becoming an official in general, and want to do the job right, whether sub-varsity, varsity HS, or, even, perhaps, some day well in the future, working at more advanced levels, then make "associations," if not close friendships, with local chapter officials that would be willing to attend local HS or Baylor games with you, or, at least watch collegiate games on TV with you, and observe the officials (not the game). Have them explain what the crew is doing, individually, and collectively, from on-field pre-game, through the end of the game. This, combined with studying the rules, interpretations, bulletins, and mechanics manuals, will get you moving in the right direction. Get snaps, and watch all the video you can.
How good you get, and how quickly, depends upon you. Your level of dedication and commitment will be the greatest indicator of how far and high you will go.
Ask questions here. We are here to help.
Robert