Welcome Aboard!
Way too much work just to fix a couple/three rust spots. If it were a fender, maybe. A quarter panel is major surgery, all you need is a bit of first aid.
But if that is what you want to do:

Sign of the times: 2016 Chevy Cruze quarter panel procedures 'very similar' to steel Mercedes steps - Repairer Driven News
General Motors’ instructions for replacing a quarter panel on a next-generation Chevrolet Cruze are reminiscent of the procedures for a steel Mercedes, P&L Consultants’ Larry...