Complete your first season in franchise mode. In the next season there should be great available free agents that can be acquired. If you do not have enough money to sign them, then go to "Manage Roster", choose a player, and go to "Edit Player". Scroll until you find "Contract". This will show their current contract (for example, $1.4 million and 4 years) and each year's salary. It also gives you the option to decrease or add a year, or even drop his salary very low in the final year, etc. For example, select Lee as the Cubs. Max his contract out to ten years, and set it to the lowest amount on each year ($300,000). Save the game and go back to free agency. Sign Torii Hunter and you should notice that you have more money available. You can do this to as many players as desired.