Thanks for all the replies and feeback.
M from MHSAA is Michigan.
The focus will definitely be on mechanics. On the sidelines, I dislike sloppy mechanics, so there is motivation not to have people say the same about me as an official

. I'm also looking forward to reviewing the casebook once I receive it.
I've already applied for membership in an association and I'm waiting to hear back. I've seen the association's trainers officiate upper-level games, so I'm hopeful I can learn form their experiences. From there, I can proceed with finding an assignor, mentor, etc.
Definitely looking forward to the experience.
PS: I also noticed upon reading the replies that Jurassic Referee is no longer with us. Hopefully, he is now getting call ing some good games thanks to the Great Assignor.