Thank you all for the info my questions are completely answered.
giriasis - yes I would definitely like to train more than twice a week, Ill have to look into it because Im not sure if the let the intro class mix in with the other classes for 2 months.
I am currently very active, lifting 5 days a week and I run 2-4 miles everydayso I dont think 3 days would be too much of a strain.
Well, if you can do more than 3 times, then do so. But, definitely ask if it's okay to do classes other than the intro. You're dojo might want you to just do the intro classes before you join in the regular classes.