Oke Yesterday evening ,it was a bit to late for me to give you some good advice:).
- first thing you should is to make a good plan what kind of players you wanna train.
I would start with training Guards,for just 1 reason,their salary does not go up that fast,if you train bigs on ID ,IS and REB,their salary will rise much more.
That player Hiid is a pretty good trainee nice skills ,although he is 19 and has some good potential.
But anyway find 3 good trainees ,and start training them and it will take a lot time maybe 4/5 seasons.
And stick to the plan ,because you will lose many games,but those 3 trainees will be your cornerstones for your starting line up in the future.Meanwhile expand your arena slowly ,for SF /PF and C just players with low salary,so you can start saving money.After 1 season of training your trainees wil become much better,and you have some money to buy a better player to fill in the holes that you have on your roster ,and please don't buy an old player cause he will lose skills and he wont be a good player for a long time,try do buy player age range between 25 -29,those players (they will be more expensive I know) will be very useful for a long period of time,and if they are not good enough anymore you can sell them much better then oldies.Just remember BB is a game for managers who will take the time to build up slowly a winning team,if you want to do it in a hurry ,you will be running against a wall,and that hurts:)