First of all,I would train your two 18 year olds and the Spanish guy.48 minutes one position. I believe I would train IS en ID. That is trained best on center.Than I would play your pg on pg.Try to upgrade a little but don't spend much on upgrades for sg,sf and pf.and I would differ tactics as much as possible, just to get an idea what all the different tactics are.Don't focus on winning yet. Focus on economy, build arena, get a good foundation first.