Doug,

I just got your PM. The MRA is always thrilled to have racers from other clubs join us. Looks like Jon already answered alot of your questions. Last time I raced MoM, your amateur classes were the same as ours so there should not be much of a difference. If you have any specific questions feel free to post them up.
High Plains Raceway runs their own track days for Friday practice. Go to the website Jon posted above if you would like to register.
Again, feel free to post up or PM me if you have any additional questions.