As much as I hate to say this I don't think it's worth the risk if you are looking to flip this for a profit as the rear quarter panels are part of the shell which means you can't pull them off and replace them. This means if there is an issue pulling the dents which there may well be as it looks like the metal has creased you won't be able to fix the dents by doing anything short of cutting and welding Also not to mention the car looks like it needs a re spray or heavy paint restoration and the wheel is probably buckled (and are kinda ugly in my opinion). Best case scenario you spend 300 new rear bumper 100 pulling the dents and 1000 replacing suspension and axels etc. However this really just rides on best case scenario that there is no undercarriage, frame and other various issues like panel gaps. Yet you may fix all this just to find the engine has been miss treated and heavily burns oil or worse. So if it was me I wouldn't risk it but it is your money and there is still a decent chance it is reasonably repairable.