Elliott's material is most excellent but I'd not encourage someone brand new to Mentalism to jump into it... there is just simply too much to learn when it comes to "the basics" first; six to nine months down the road however, I can see no wrong in said action. It will allow you to see just how much further you can go with such a simple item but one that prepares you, in some quite literal ways, for a career.
There is one very important point that needs to be said however, when it comes to billet work in particular; you need to cultivate your people skills and ability to "Read" others in that 90% of what you do with billet's is going to, in some way, be a kind of Q&A bit of business. That being the case, you need to have a bit more than a rudimentary study of "Cold Reading" as most know it. But I would caution anyone with less than a year's experience of doing actual Readings using a legitimate system like Tarot, Numerology, etc. to NOT dive into the Ian Rowland or TRADECRAFT books. Start with Lee Earle's Classic Reading, the Bob Cassidy dissertation on the subject and EVERYTHING you can find on the topic by Richard Webster, Ron Martin, Gene Nelson, Enrique Enriquez, Kenton Knepper, John Riggs and Jerome Finley... then if you get bored, you can take a look at my stuff, Herb Dewey and Brad Henderson...
The other two books, the two books that get hyped the most, were composed by authors who've never made a living as a Reader and who have well established bias towards anything that remotely smacks of being Paranormal; these folks aren't "Skeptics" but rather CYNICS and that is a difference that can cost you your soul...so to speak, when it comes to learning how to actually do this particular side of the job.
Yes, I have a bias on the topic as well... I want people to learn things from all sides of the issue rather than insisting that there is just one "truth" based on incomplete information.
Once you know billets and how to do solid Readings, you will never have to worry about your survival, whether it's doing "shows" or table-side Readings, you will have a way of working literally at the drop of a hat and without the headaches tied to agents, bookers, crooked club owners, etc.
Enjoy the journey
Oh, Mort!
I nearly forgot... you mentioned the two Banachek books... PS3 comes out in September of this year, so you need to save up a few more pennies than you'd planned
