In my opinion the books and videos begin to make sense after you have gained a certain level of experience and proficiency.
My advice would simply be to play a lot of 14.1 for now, books and videos later.
This is good advice above.
I would add that when I started playing straight pool (I am not as accomplished as some of the guys here, but I am not helpless) I found that the game was forcing me to learn ALL of the cue ball in order to get more ideal angles when running into clusters (see SJMs comments).
I have found that picking up my pace of shooting helps me. There is some merit to playing fast...for me. My top three runs (42, on three instances) all occurred relatively quickly.
Also, when I started, I was always nervous about getting a break ball, so I would SLAM the pack during my break shot. There might be times for this, but I have learned that break shots are easier to manufacture than I originally thought. If you run the balls smart and have a little cluster left in the stack, and you break that cluster at the correct speed (not very hard) with an insurance ball waiting, VERY often a break ball comes out of that.
I hope this helps.
kollegedave