3 Do's
1) Move balls towards your pocket while at the same time, not leaving your opponent a shot at his hole.
2) If there are balls down on the end rail near your opponents pocket, a very good shot is to put the cueball behind them. So cueball in between your opponents pocket and the ball near the end rail.
3) Always check the rack from time to time because as balls get shifted around, you could end up finding a dead one in your hole or one that gets very close that would be advantageous to shoot at.
3 Dont's
1) Don't be tempted to shoot at your pocket just because you have an open shot at your hole. If its not an easy shot or one you are 90% confident you will make, you could miss it and sell out a few balls or even the game if you miss.
2) Don't disturb balls or packs of balls when they lie in your favor and not your opponents. (Meaning if there are 2 balls tied up in the middle of the table and both go in your hole but neither one will go in your opponents, leave them be)
3) Don't try to be fancy. KISS (keep it simple stupid) on most shots. Shoot shots you can personally execute. The great thing about 1p is you dont have to be the best shooter and able to draw the cueball 5 rails. Play smart and patient and move the balls wisely.