You just need a wheel that will fit the spacing in your dropouts and has the correct set up for your gears at the back. It will probably be either a S-group cassette or freewheel.

Your local shop can do all of the measurements and get you the right wheel or may have one.

In terms of using a bike on the trainer make sure you are regularly cleaning your bike especially any places where you are sweating and you are still lubricating your chain and inflating tires basically you should do the exact same normal maintenance everyone should be doing on their bike when ridden on the road except you should wipe down your bike more often sweat is quite corrosive.

We had a customer come in not that long ago and their handle bars where full of holes and covered in white powder because everything was so corroded.