Rough-turning the wood into very thick bowls will aid in drying. Rough turn them, put them on a shelf and forget them for several months at least. Some will dry perfectly, some will warp, some will crack. Those reasons are why you leave them thick and go back and finish turn them after they're dry. A good rule of thumb for green wood blanks is 1 year of drying per 1" of thickness.
If you intend to do something other than bowls, I'd cut the logs into usable sizes and immediately seal the end grain with anchorseal or paraffin. If you don't seal the end grain in short order, you're guaranteed to get cracks and checks during the drying process.