Bodywork Questions, also dumb mistakes

Got a couple questions, somewhat related. First of all, the front of my 68 Valiant has been probably nosed into a ditch, so the fram ahead of the k-member needs to be straightened out, gotta find a body shop that has time and isn't scared of old cars to fix that. The same accident (I assume) resulted in the passenger side fender being pretty well mashed. I picked up the front clip off a junkyard 4 door 68, so I have replacement fenders (both sides), hood, bumper and turn signal housing piece (goes above bumper, below grill, idk what to call it). The only problem is tha tthe passenger side fender on that car has its own damage.
My first question is which fender shoud I use/which would be easier to get straightened out?20200326_133528.jpg
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Secondly, I made quite possibly the dumbest mistake I've ever made with a car on Monday. Had done some work on the rear suspension and neglected to tighten the driver's side rear lugnuts. Tire fell completely off the car and smoked the rear quarter panel, folding it over almost a full 90 degrees. Fortunately that was the most of the damage done, but what's the best plan for that? Just bend it back out, hammer out the dent under the gas cap from inside the trunk? Really bummed about making such a dumb mistake that hurt the car that bad.
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