Repetition is huge. U dont need a shop or range to do this.... your back yard, garage, living room, whatever. Just get a high quality target, the range is less important for what your trying to accomplish. Actually you want to be close. In addition I might suggest working a "blind bale" session for form.... and if the target "feels" to close put a smaller spot to shoot at. For basic strength building routines, shoulder excercises are great, but work in back excercises as well, and PULL UPS!!