For going all raw a lot of places suggest fasting and switching cold turkey. I still feed some kibble due to the rest of the family being squeamish, so I started by using raw as a topper for kibble, then increasing the amount.
As far as supplements go, if you are feeding whole prey, head and all, everything your dog needs should be in there. Any part that is missing takes away some necessary nutrients. Even then, due to pollution and environmental factors, I still want my dog to get extra antioxidants.
