Keep in mind that when getting into this seriously, you need to be aware that you'll want tricks that suit YOU and not who you learned from. I agree that the Real Secrets of Magic set is full of great material and wonderful teaching, BUT... The material is really tailored to David's persona. You don't want to try to mimic him if that's not what you're naturally like. Take his advice and run with it, and maybe pick out a few techniques or ideas you like and build on them to create your own routine.
Bill Malone has a great 4-DvD set called On The Loose. It's expensive, and the material is fairly difficult, but the advice he gives is just wonderful. He tells you his own personal approach and tricks to getting a gig and keeping the job, all the while improving your performance.
If you're out to find your own tricks, I urge you to look for certain things. Make sure that it has an instant or fast reset if any, because you're going to want as little downtime as possible. Also, make sure to have a wide variety of tricks, for different ages and personalities so that you can use what you feel fits best with the situation. Mainly, find the tricks and effects that you feel represent yourself; I think that is one of the most important things of all.
I hope some of this may have helped, and good luck to you.
Peace
