Welding = Bad idea
All the welding will warp the shit out of the metal. Too much work
Best option is to have the panel re-finished by a GOOD shop.
Cost? Depends on dent. Could be up to $500 w/ paint for a GOOD repair job (read: little or no bondo)
Other option is new Rear Quarter, but thats like $1800... not including labor for install/prep/paint
Good luck
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