Couple of thoughts on this one,
First off, attend a convention or two, and see what you can learn there,
Secondly, a couple of years ago I went for a day with Colin Rose, a very well respected member of the magical fraternity. From that I got a different insight, had a good day out and made some new friends.
Books are good, you can pick them up any time, read a little then let yourself digest it.
DVD's I am less keen on, though I am sure others see that differently!
Chris
