No one leaves you hanging Johnny5. After you assemble the machine if you have any problems or questions the carbide3d team will help you. Like they did to me. Welcome to the newbie club btw. I'm just like you. A newbie who bought shapeoko 3 some days ago and trying to learn it.
About half size cuts, i had the same issue. Here is your answer: http://docs.carbide3d.com/article/45-machine-is-moving-cutting-at-half-size
Regarding detailed instructions on how to use this machine, im not sure. I just followed the links in my emails that carbide3d team sent me. It's easy enough to make something in CC and cut it. You just need to play a little bit with CC, CM and your machine.