Both your ideas are right.
If you plan on turning them wet, and very soon you won't need to anchor seal the ends. If it'll be a few days or a week or two before you get to all the blanks, then you should anchor seal the ends.
Cut them into blocks and seal the ends.
Turn them thin and put them in paper bags for a while and if have a small scale, keep weighting the blanks. Once they stop loosing water weight, they should be dry. They might warp out of round but for a natural edge bowl, it generally isn't that noticeable and most of the time adds a nice look to it.