thats a tough call, I would take the 1 which is in the best shape, make sure you take a knowledgable friend with you to look at all 3 then take the best 1 to a mechanic so he or she can check it out, good luck
rear brakes are stuck, try going back and forth several times to break it free, Is your emergency brake on? If going back and forth does not help, you need to take the drums off and re-adjust the brakes, this can be done without taking the drums off but you need to see if anything else is wrong...
spray heavily with wd40 and let it sit for an hour or so, wip it down and that should take care of a lot of it, unfortunatly, thats about all you can do, you are talking about the chrome? You cannot sand chrome.