Offense- Run the ball, using lots of misdirection. Keep the passes short and YAC-focused, to avoid the pass rush adn force the DBs to tackle. When going deep, attack the middle of the defense with TEs and RBs as well as 3 and 4 receiver sets.
Defense- Mix it up, use lots of zone blitzes combined with soft zones. Ideally, you want equal parts of 3 man, 4 man, 5, and 6 man rushes. Don't let Romo get past your edge rushers to the outside-- force him up in the pocket, but not sideways. Don't let Witten get any free releases, bracket him if you don't have a LB/Safety who can cover him solo (most don't). Let Austin have his way if need be, you need to shut down Witten first.