hello, i think i can offer you some assistance to get the rotor off there is an oring on the hub that holds the rotor on and prevents rust from building up as well, you need to remove that oring before the rotor can come off, below is a picture number 2 is pointing to the oring.
ok from the beginning we remove the wheel and tire(obvious) and then the caliper and set it aside, then once the oring is out of the way tap the face of the rotor with hammer to get it loose from the hub , if it feels loose on the hub and wont come off what is happening is the parking brake shoes are hung up on the rust lip that forms on the inside edge of the rotor that they ride in. we will need to back them off by removing the plug at the bottom of the backing plate and using a brake spoon or flat head screwdriver turn the adjuster wheel till they are backed off enough to get the rotor off. i usually try to turn the rotor every few turns of the adjuster to make sure im turning the adjuster the right way. if the rotor gets harder to turn that means im tightening up the parking brakes and need to turn the adjuster the opposite direction.
here is a picture of where the adjuster is.