It's your universe. Use whatever you feel will enhance your CFM.
I am now in year 4 and I am going to employ a rule from the SOS league. But with a twist.
They use a 3+1 where you pick just 3 players to resign and 1 to franchise tag.
I am going to expand that to 5+1 and for the 5 players. I pick whoever I want to franchise tag (no random number for that) and whomever I want to resign. I can then create story-lines for star players walking if let's say:
Dez Bryant leaving Dallas to play for a winning team as he wants one more shot at a Super Bowl.
Or
Andrew Luck looks to go west to play for the Raiders (whom by the way lost Derrick Carr in free agency in my current CFM to the Washington Redskins!!!).
It's your world. Do whatever makes it fun for you.