Howdy and welcome to IV9.
The best thing you can do when first starting this game is read some forums om how to get started. Players much smarter then myself have come up with many tips and tricks that you can pick up in those forums.
now if I were starting over I would :
1) pick two 18 or 19 year olds who play the same position and train only them every week. Long term goal is to keep one and sell the other.
2) expand the arena. Must keep the money coming in.
3) buy some older players to fill roster spots that are not being trained. These guys are just temp so you can get a few victories.
4) Don't get discouraged. Your going to get beat up early on but just hang in there