The good thing is the lines are clear with no blockages. You need to do the rears the same way Wheel cylinders are cheap. At least on rock auto for some reason i think the RH one is.
Theres several ways to go on this one. If the left one bleeds fine and doesnt leak, you may want to concider leaving that one alone if its not leaking, and just change the bad one, install new shoes etc, however if it leaks later on, you have ruined a set of new brake shoes.
If they are not going to be permanent because you will be eventually going discs in a few years, id go bare minimum you need to have it safe. Change the lines, wheel cylinders, master cylinder, and shoes. Get the drums turned on a brake lathe. Repack inner and outer wheel bearings on the front, and reuse the return springs that you have unless spring hardware kits are cheap enough. With the new shoes set to the correct drag initially with the brake spoon , this setup would be ok to safely stop a stock 318.
Rockauto will help you keep it cheap.