I agree with what the others have said about your attendance, it'll pick up quickly, but you still need to be careful with your spending. You should get 50k a week for the first 4 weeks, which is a huge boost. Your TV game (the last one of the season for you) will bring you around 300k thanks to your division, which should get you safely through the offseason.
In terms of training, the prevailing idea is to either train "inside" guys or "outside" guys. This either means your PF/C or your SG/PG. You can mix in some training for your SF if you're clever. Guards mostly use the first 6 skills (jump shot, jump range, outside D, handling, passing, driving) and big men use the next 4 (inside shot, inside D, rebounding, shot blocking), but some of the skills matter for both, like how your PF might also use driving or your guards might also need some inside shot. It's pretty intuitive with real basketball.
Guys with balanced skills train faster, so when looking for trainees you would prefer a guy that was "average" in jump shot, jump range, outside defense, and handling to a guy who was "strong" in jump shot and "atrocious" in the other three.
In order to keep the skills balanced and the training faster, lots of people rotate among several skills, training each for 2-3 weeks at a time. For instance, for my guards I do 2-3 weeks of jump shot, 2-3 weeks of pressure, now I'm on 2-3 weeks of driving, etc. It's a little easier to train big men since they have less necessary skills than guards.
Trainees are expensive, especially balanced 18 yos, so I'd look on your team and see if you have any youth at a position and train that if possible. Training speed just doubled, so if you make sure your trainees get 48 minutes at the right position you should see some pops fairly quickly.
Hope this helps!