Create as many players as desired for the positions you want by using the 
"Create-A-Player" option. Collect the players you have made from the free 
agent pool and sign them to your team. Once you have all of your created 
players that you want, go to "Roster Management", then to "Long-Term 
Contracts". Offer each player you created a long-term contract at the 
same, or even for a lower price than they want. Since the players are not 
proven in the major leagues, they will sign for basically nothing (just 
for the chance to play). You can now edit their stats in "Player Editor". 
Make each player the best that they can be (everything A+), and you will 
have the best team for the lowest price. Use this in franchise or expansion 
modes.