First of all, get your hands on it and get it home. You'll have time to figure out the rest once you do that.
Get it home, test the moisture as soon as you get it there. Continue to test it every day until it's about the same 3-5 days in a row.
It might be dried, but it still needs to acclimate to where you'll be working with it.
If it's timber, you'll need to shave the bark off it, at a minimum. This is best done with a hatchet, but anything you can use to get it off without damaging too much of the wood underneath is fine.
If you want tool handles, go ahead and chuck it on the lathe and go to town. If you don't have a lathe, it's going to be very difficult, but not impossible, to get it round.
If you want S4S (squared on all four sides) boards, you'll need a table saw (or maybe a band saw would do), planer, and jointer to get them within 1/16" of your final desired dimensions, then sneak up on final measurements with your planers.