Take the bark off. Do not seal the full length after bark removal. The idea is to let the moisture escape that way. You can either let it set untill you want to work on it, or you may split it now. Splitting it now will help it dry more quickly, and hickory is very wet wood. I've not used a band saw yet, but I don't see why it wouldn't work. I've used an axe to begin the split at one end, and continued it with two wedges, leapfrogging down the log. If you do cut the longer one in half, you will have two very short pieces. I guess they would make good youth bows. I dunno. If you want to make a full size bow of it, go ahead and shorten it to 6' or so, then reseal the newly cut ends. Split and rough out the form of the bows and then let them set for a while to get the moisture down before you start tillering. This will help you avoid some set.
Hickory is good wood! Enjoy!
Incidently, when you do split the logs, look to see where any knots/twists/etc are and see if you can get them positioned conviently within the stave. This may mean splitting the log so they wind up on the very edge of the stave and will be removed in the profiling process, or it may mean having them in the center of the limb so that more wood can be left on the belly side if need be, or it may mean laying out the design so a big rough knot is where your handle will go and making a ridged handle design. Fortunatly, hickory is really tough wood so you have a lot of options. I'm pretty new still, but I haven't even blown up a hickory stave yet!