Some breeders start on live, some don't... Most BP's can be switched over from live without too much trouble.
An 8-12 month old BP is going to weigh aroung 500-1000 grams, not 150-200 if you want 150-200 you are looking at a 2-3 month old BP.
BP's can be hard to start eating right out of the egg, but after that I really haven't seen much difference between a 2 month old and a yearling.
Checkout the BP care sheet: http://ball-pythons.net/forums/showt...ius)-Caresheet