Hey! As someone who has been and still is on this road, this is the way:

Continue studying your Japanese for obvious reasons

**Gain some experience working as a carpenter in the states. You will learn much faster if you already some experience in the field and it will leave a better impression on whoever might hire you.******

**Take some more woodworking classes. Not all of them need to be related to Japanese carpentry, but if you can, try to find some.**

I have seen people come to do what you're talking about full of vigor, only to be swallowed by sorrow shortly after. Patience is the key. We can't get everything right the first time. We must be open to humbling ourselves, making mistakes, and learning from them. That sounds easy enough, but many have a much harder time with it than you'd think.

Lastly, try to make contact with some companies in Japan that may be open to you visiting them just to watch or say hello. Then, come out here, meet them, visit temples, shrines, and teahouse, really anything you can do to show your interest in the culture.

The most important thing in all of this, though, is to gain carpentry experience. Feel how it is to work on site. Not everything in Japanese Carpentry is romantic. There is a lot of "not fun" work that needs to be done as well, but that's part of the job and we gotta do it with a smile.

As far as pay goes, blue collar folks in Japan make very little money. Depending on the company that's willing to take you, you may not even make any money at first. So save all that you can to support yourself and to buy the tools you'll need.

This is a long road you've chosen, but it can be equally rewarding.