Watching good players was what did it for me, to get a general idea what this game is all about. I learned how to play position (in any game), how to use a good break ball, and so on. Watch Niel's 130:
http://www.youtube.com/watch?v=vZYaex9CDaU
As my game and fundamentals improved over time, I also gained more experience and learned what works for me and what doesn't. In 14.1 I see the table as a puzzle and my job is to find the easiest way to solve that puzzle. Phil Capelle's book helped a lot.
If you think your fundamentals are fine and you want to run more balls in 14.1:
Master the stop shot, stop-follow shot and stop-draw shot. That is, after the cueball makes contact with the objectball it will travel just a couple of inches back or forward. You will need this a lot.
When you get to the table, identify your break ball early, and don't touch it.
Identify a key ball (and a key to the key ball) that allows you to play easy position for the break ball, and don't touch it.
Deal with problem balls and clusters early, the longer you wait to break up a cluster, the more difficult it will get. Find good "secondary break balls" and find a way to get position on them.
When breaking up clusters, look for an insurance ball, that you will most likely have position on even if you get stuck to the balls.
Don't shoot too hard when breaking up small clusters, you don't want the balls to spread all over the table without control, you just want to seperate them so they all have a path to a pocket.
When no balls are touching and every ball has a path to a pocket, don't try to move them any more, unless you have no other choice. Look for an easy way to get position on problem balls that block other balls or only have one pocket.
When you find yourself playing three rail positions or extreme draw-shot-type positions, you probably chose the wrong pattern or you made a terrible positional mistake before.
In order to do all this, you need to go around the table often and look at the situation from every angle. Don't just shoot the next ball because it looks convenient to you. It might be a good key ball for your break ball or a good secondary break ball.
There is more, obviously, but you should be able to run more than one rack.