I would strongly recommend changing out the pads while you have it apart, but if you decide not to change them; no adjustment of the caliper is necessary. Because the new rotors will be a little fatter than the rotors you remove (because of wear on the old rotor) you will need to compress the calipe...

1. No, front and rear can be done separately. 2. No, wheel bearing are generally changed only when they fail. 3. Springs are fine, unless you're looking for a performance or appearance upgrade 4. No springs in rear, just shocks and upper shock mounts 5. Probably the OEMs. I personally don't like the...