The first thing you sould know and rememember is that you play in long term. Every decision you make will affect later. I just suggest you to spend your money wisely. First of all you should read game manual. If I were you I would buy for myself/pick in a draft some young talent, not for much money (up to 50k). Train him for 1-2 season with some income. During this time you will learn something about game, how to play, manage minutes, what skills are best for positions, extend arena then sell those players or just keep them and buy another players with knowledge about the game.