What Indutrialchild said.
These books are fantastic, and aren't your ordinary set of magic books. While they will teach you many effects, more importantly, they will teach you showmanship, creation and theory. Some parts are going to seem outdated, don't let it bother you. I take them for the humor they are now and keep plowing through. Theory and psychology do not change, just perhaps the way we use or relate to them.
Go through them, reading what looks interesting. Read the theories and information. Keep doing this, adding the layers. If you're a smart guy, as you make your way through it, you're going to start recognizing effects in there that are currently on the market selling for big money and effects being done by big name magicians. Not that any of these people are 'ripping off' Dr. Tarbell, it just shows what this education will give you when you realize what can be done with some of the seemingly simple gimmicks and maneuvers Tarbell teaches. I think the most important thing that Tarbell teaches, which seems to be lost on a lot of people now days, is that it's the magician, not the magic, that make the show. The magic is just the means for the magician to put himself in front of the public. What that means, at least to me, is that it's all about showmanship and personality. If you have those two things, you can work svengali deck and get a FOX special. If you don't, you can be turning Elephants into raisins and men into women, and nobody will ever want to pay attention to anything you do.