Okay first off welcome to the forums, we have a great deal of people here, with a vast knowledge base. I don't use propane except on my grill for fast cooking. So the person to ask for that question to be answered would be Big Wheel.
For question number 2, how long should you cook your bird. Generally they say that turkey will cook at 30 minutes per pound @ 225 when smoking. Your bird is basically 13.5 pounds. Your cook time should be around 6.75 hours. Make sure you cook until both the white and dark meat reach an internal temp of 165 degrees. When you have achieved this take the turkey off and let it rest for atleast 30 minutes before carving. Since the bird is gonna be all alone on your smoker, I would suggest that you brine it. This will as moisture to the turkey, and will not dry out as fast.
As far as using apple wood, most of the wood that I use is fruit wood. Apple wood being no exception, actually I use apple wood the most, because we have an abundance here in Michigan, along with cherry wood. Yes you can use apple wood with bark on it, after all that is wood too. If you are using new wood (fresh cut) you will be getting alot of smoke from it. I think fruit woods are better for using with foul, it is alot less pungent, and gives a sweet flavor. The only drawback to using fruit woods is that it does turn whatever you are smoking very very dark in color. Case in point. 2 turkeys left one was smoked with apple and cherry woods, and the one on the right was deep fried.
I hope this has helped you somewhat.