Run it from 8-10 weeks.
I personally love 50mg a day for 10 weeks, but most guys run it at a little lower dosage.
I really don't think the creatine on var is any better than on any other steroid. It's not useless though, it does help increase strength so you can really get the most out of the var.
Var is mildly suppressive, it can shut you down.
I'm wondering if I personally get shut down on anavar because the difference is night and day when I'm on it compared to other roids. I still have my normal sex drive and ball size on anavar. One of these days I'll get myself tested at the end of a var only cycle to see what the suppression is like.