Ah, hell, I'm in a good mood.
The limited number of variables are arb/FA on your team. And which players you will arb, which ones you'll sign LT, which ones you hope to retain and which ones you'll let go. And, of course, changes based on trades, injuries, unexpected needs and any number of other things that change your plans next season and the 3 seasons beyond that.
I guess, on second thought, the number of variables aren't that limited at all.