FIRST, buy a bowl gouge! No spindle gouges allowed! LOL
Turning the wood green is what most guys do because it cuts easier and better. You can turn it dry, but it's going to take longer, and your going to get covered in a ton of dry pokey chips. Lol
There are a few different ways to dry them once turned, alot of guys will fill a bag (or tub) with the chips that came off of it, then you put the roughed out bowl in them. It keeps it from drying to fast and cracking. You can also soak it in DNA, I have done this before, it worked, but I wasn't a big fan. I like to coat them in Anchor Seal, let them sit for about a year (depending on thickness) and then finish turn. I don't remember what the formula is for getting the wall thickness, but I think it's like 20% of the diameter????
Hope this helps