Yup, just spray down the rotor really well - make sure all that oil and grease is off. That's there to prevent surface corrosion, as the machined rotor will rust almost immediately. As for torque ratings - stick with the ratings you see for the same generation of car - if possible, the same model year, as there could be year to year running changes. Yup - lugs are 76ft.lbs - doesn't matter if they are alloy or steel wheels. Ramming the lugs on at much higher torque (read - tire shop goofballs) - and there is a chance you could warp the rotors.
Everything you unbolted should have the torque checked - especially the torque plates. That bracket that holds the caliper - as it will be subjected to quite a bit of force. I'm pretty sure that the torque ratings are listed around the forum. I'll check back when I peek at my FSM and see if I can get you some numbers.
Nothing wrong with being cautious - better safe than sorry.