Welcome, Jeep Guy.
First, let me introduce you to a fellow "Ann Arboran" -- "Mr. Pockets" is there in your neck of the woods. You need to get together with him. He's quite knowledgeable about the car (Real Name, Nick Owens -- drop him a PM.)
Answer to question #1
TSB #ATRATB294
It is critical to tighten the axle and lug nuts to factory specifications.
WARNING If the factory tightening specifications are not followed, bearing life will be shortened or mechanical loads will not be spread evenly.
Install axle(s) and wheel(s).
Install nuts and hand tighten.
Lower vehicle until wheels begin to touch the ground.
Note Some vehicles use torque-to-yield bolts. These bolts should be tightened an additional amount beyond the listed torque specification. The extra amount is listed in degrees.
Answer to question #2
http://www.subaruparts.com
Answer to question #3
If by "housing" you mean the steering knuckle, that'll run you around 200.00.
Hope this helps, and, again, welcome.