If you haven't already, you should at least read the Sheldon Brown article an Wheelbuilding, see the sticky on top of the Mechanics subforum and navigate to Wheels. This covers the basics of wheel design and some very useful insights. Some of the info is a little dated but applicable still.
The Sheldon site cover many things about bikes repair and a great place to learn for people of all levels.
Also use the link to the Shimano site and search the tech docs. for manuals of component installation & maintenance. Your XT hub is a little different from what you may see on youtube videos, it uses different bearings, cones & locknut, and an alum. axle.
You really should check if other bike shops in your area can help you find a good wheelbuilder who will be able to work with you to get a suitable wheel built.
Anyone on here have a recommendation for the OP? Bloomington, Minnesota area, not sure what part