spindle question

So I went to the local parts store today to pick up some new calipers and rotors for my 68 Dart... I already have 73 Dart BBP spindles so I was just gonna get the calipers and rotors to match them.... They asked if the caliper was mounted in the front of back of the spindle? Which ones do I need>?

Do rotors come w/bearings and everything I need?

Jason