In reading your question, i am left wondering whether you want to timber frame professionally or for your own sense of accomplishment. If the latter, I commend all the prior posts. Read and attend workshops or rendevous.

If you want to become a professional timber framer, my advice is a little different. I would look for a job in a high volume timber frame shop. It won't pay well, and may not satisfy your aesthetic sense; but if you want to learn to cut joinery quickly and efficiently, I can think of no better way. If after gaining proficiency in the mechanics of timber framing, you want to explore other paths, that's great. It's what I did. I now own a small shop in Virginia with my wife.

Whatever path you decide on, an active approach to guild membership is vital. The guild is a constant source of inspiration, education, and (most importantly) friendship.

Having all the fun there is,
Bob