Here's a question for you: what did you do in the 24 hours between those posts to seek the answers to your questions?
They are as follows:
1. Yes, more slowly.
2. Roots thicken faster underground than above.
3. Roots grow somewhat like branches. They extend and fork at the tips, and bulk builds behind them.
Patience and study is important in this art. Iirc, you bought a big maple, talked for a day or two about being patient, then maybe chopping, then maybe layering...then, suddenly, it was chopped. Then 2 threads about chopping down a juniper, with most advising against it...then a new thread and it was done. I understand and applaud your enthusiasm...but...
May I suggest:
1. reading some basics on horticulture (there is a right season for everything, and you're going to learn it...its up to you to determine how painful and expensive you want it to be).
2. reading and studying basic bonsai styles, techniques, and principles. Look at lots of photos.
3. if you're really coming here looking for advice...take it, or the responses will start to come few and far between.
kind regards,
BVF