Once you get it to turn, there are two things to do. First, in all likelhood, there will be a ridge at the top of the cylinder. You will be able to feel it by running your finger along the cylinder wall. This has to be cut down by using a ridge reamer. I think these can be rented. It is a hand tool that fits inside the cylinder and you turn it with a wrench to cut the ridge.
Next get a cylinder hone, attach it to a drill and using some oil hone the cylinder.
I would recommend getting some more detailed instructions then just what I have told you, but this will clean things up for a start. It is also one of the first steps in rebuilding your engine.
Repairing your valves is another adventure as well, requiring a few rentened or borrowed tools for a simple 1 valve replacement. However, usually more than 1 valve is bad or close to it, so you should take the entire head apart and check them all and the head for cracks and warpage.
Many of the trucks here have their original engines replaced with a newer engine. You may have to decide between rebuilding your original engine and upgrading to a running newer stovebolt.
Mike