Paul,
Besides Emmet's good advice, I think it depends on a few other things:
Who is the Apprenticeship with? The timber framing community is tightly knit and the company you train with needs to have a good reputation and do things in a similar manner as the new company your going to seek work fropm. There are no standards. Find out what previous apprentices are doing now (get recommendations).
Also, nothing can substitute for a good work ethic, leadership qualities, and ability to problem solve and be self motivated. Many companies are willing to re-train you to their specific requirements even if you learn at someplace that does things very differently, but they DON'T want to teach you how to work and be a responsible employee.
There is lots of work out there. Expect to start at $10-15 an hour and reach a ceiling of $35 an hour (or so). Do make any more than that you would need to move into company management, project management, design or start your own company.
Oh, and remain a Guild member!
Good luck.