bowl blanks

I have become the proud owner of a recently cut Persimmon log about 8" in diameter and 6' long. I am trying to find information on the best method of drying this wood. I understand that it can be very difficult to do so without it warping and cracking. I have found suggestions that the best way...

I'm just getting into turning and picked up some chunks of wood. I was wondering if I have to HAVE the center of the log as the center of the bowl or if the bowl could be turned by using any "chunk" of the log?:question: ...any direction? Here's a couple pics of what I have. I hope to get this...