based upon last years' stats?
Obviously you will just have to make a guess for rookies, but I went through my lineup looking at minutes played and FPPG last year, and allocating 48 min for Cs, 96 min for forwards, and 96 min for Gs.
This will give you an average game, but under the scenario where everyone was healthy for the same game, which is unrealistic.
Anyway, my team scores 243 in 240 minutes.
I need a good team doctor, however...