I have lots of different drills for 14.1 that I developed myself, for my own use. They may not be suited to you, though. Perhaps if you tell us what you want to work on, we could help you better?
Try a game of bowilliards and tell us what your score was. That will give an idea of your ball running ability, with balls in open play. There is a thread about it in the main forum. It's a good exercise for all pool games, and very good for beginners. I would suggest this drill/game to you right now as a good way to increase your ball-running ability, combined with the 5 ball drill.
Here are some drills I have used, some are adapted from others and changed to my liking, a couple I invented myself. I have more, but they are too challenging at this point, I would think. It is very important to stay motivated when practicing. If a drill is to difficult for you, stop using it or make it simpler. When a given level of the drill becomes too easy, increase the difficulty or move on to something else. If a drill is boring you, again, find something else. If you practice in a half-assed manner, your game will suffer the same fate...
1. SP_99's breaking game: Focusing on the opening break and using a score system. The goal is to make a legal opening break (safe break) and leaving the cueball within a balls with of the head rail. If not you don't, you do not score any points for that inning, and have to start a new inning with the break again. If you do get the ball to the right place from the opening break, you get to continue and try to pocket a ball. I If you pocket a ball from there, you get 1 point, if you pocket a ball AND get a shot at another ball you get 2 points. From there you re-rack and start over with a new inning.
2. 5 ball drill. A classic. Spread 5 balls randomly on the table. Run 4 and get on the fifth as a break ball.
3. Sp_99's 3 ball drill. Freeze 2 balls toghether anywhere on the table (but smart to start in the rack-area). The third ball is put in a random place anywhere on the table (again, smart to start with the ball somewhat close to the rack area, and incease distance later). Take ball in hand above the headstring on your first shot and try to run all 3. You can break the 2 balls up, or play position, whatever you feel like. I score this drill as well. Each ball gives a point. This is quite tricky, more than you probably think.
You can add a couple of "free" balls up to a total of 5 to make it easier (because you get more chances to break up the cluster). Ball in hand only on the first shot.
4. The L-drill. A classic. Look it up. While not specialized for straightpool as such, it teaches skills that are very valuable for straightpool players.
5. Line up. Another classic. Look it up. More of a general skill drill, but can be adapted with "restrictions" to work on specific skills.
6. Up-table straightpool. You start with a side of the rack breakshot, with ball in hand behind the headstring. Run as many balls as you can, taking ball in hand behind the headstring on each shot.
7. The grid. Placing all 15, or even up to 45 balls on the table, each ball placed on a diamond intersection point, try to run all the balls without ever touching another ball with the cueball. The balls have to be pocketed cleanly, no combinations. If you only have 15 balls, use only a small part of the table to get a tight grid. Very good for tight cuball control in small spaces.
