I have been looking to buy some bowl blanks to turn but just about all auctions say (Has been cut Green and sealed with wax) Correct me if I am wrong this is green meaning wet and it need to dry before it can be turned?
Almost all bowl blanks are sold green/wet. This is because it takes a long time for a solid bowl blank to dry completely. You can occasionally find kiln-dried bowl blanks which should be dry throughout. These can be turned to final shape and finished in one go.
For the green blanks, the method that has worked best for me is to turn the bowl to rough shape, leaving the walls and bottom extra thick. I then pack the rough-turned bowl in a paper grocery bag with the wet shavings that I just made. I label the bag with what's inside and the date that I packed it, and it goes on a shelf in the garage to dry. I live in Texas, and my garage gets quite warm, so even large/thick bowls are usually ready in 6 months if not less. Your drying time may be longer. It of course depends on how thick you left the walls on the roughout, and how wet the blank was to begin with.
Every week or so, I check the progress of all my rough-turned bowls. If they are developing cracks, I zap them with CA glue. Then I churn up the shavings, repack the bowl, and roll the bag back up. If the bowl has cracked with anything bigger than a hairline, I put the sealed bag inside a second grocery bag to slow drying a bit more.
Most straight-grained woods will shrink more on one axis than the other, and your bowl will become elliptical. This is why the walls are left extra thick. Once the bowl is dry, place it back on the chuck using the original tenon or socket. Using the tailstock if you can, turn it back to round, then turn and sand to final shape.
Bigger bowls obviously warp more than smaller bowls, so the walls need to be thicker to assure you have enough "meat" left so that you don't completely turn through a wall when you are turning to final shape. The formula I've been told is that the thickness of the roughed bowl's walls should be 10% of the bowl's diameter. In other words, a 10" wide bowl would have walls that are 1" thick. I don't really measure this, it's just a rough number that I shoot for. A little thicker never hurts, it just slows drying a bit, which may not be a bad thing.