First the Cowboys need to figure out what they are going to do with their own. Are you willing to pay Flozell and Hamlin? Can you get deals done with some of your young players and keep them in the fold?
After that is done, (and I think it will get done) you have to decide what are the biggest holes left to fill.
I see corner as being a huge need. Jacques Reeves was obviously in over his head just a little bit. I think they'll look to improve there, and I suspect they will try to minimize their reliance on Anthony Henry. I'm just not sure the coaches trust him as much as so many fans do. Because of that, I expect Dallas to look for a solid starting caliber corner who won't break the bank. Drayton Florence seems to fit the bill.
I'd like some speed at receiver too. I don't think Dallas will spend much in free agency here though. For one thing, I think Dallas already signed a free agent receiver named Patrick Crayton. I suspect they look to draft to fill this.
Running back may be something that gets filled in free agency. I know most people are pretty convinced that Jerry will try to fill this in the draft, but I'm not sure they will want to completely rely on a rookie. I kind of expect a solid veteran who might be able to help on special teams too to be added to the mix.
And while all of this is happening, I think the team will be looking for more role players, speed, and leadership.