Your plan sounds good. I was lucky to be part of 2-ump system when I started out at 18. I usually worked the bases with a "top-notch" umpire working the plate. Important key to my development at that time was a good pregame with the partner, and a good postgame as well. Make sure the pregame with coaches include the emphasis go to the umpire who made the call, to avoid them coming to you on something she called. Good luck and let us know how it goes.