Auto body repair & detailing: repair rear fender, spot weld drill, spot welds

Question
hello my name is holly i work with cars but never tried any autobody reapir. well i have a geo tracker and the rear left is in bad shape well it was hit and the guy before me cut it out and bash around on it so i took a come along and pulled it out and put it back as much as i can so what can i do to fill in the rest like cut off another geo or make it my own with sheet metal and a welder and tell me how the bondo and primer and paint goes so plz help me out and thank you very much  

Answer
Hello Holly! Have a junk yard cut a rear fender out of another car, and graft it in. Drill out the spot welds on the old panel to remove it, you may need to get a little creative to make it work, but it can be done! Drill what you need off of the used quarter section, and weld the new panel on with plug welds where you  drilled out the old spot welds. When drilling off the panel on your tracker, use a 5/16 spot weld drill bit, and try to only drill through 1 thickness of the steel. Try to not drill all the way through. Graft the new panel into the old about half way up the sail panel, be sure to overlap it about half an inch or so. (2 door tracker) On a 4 door, graft it in about half way up the window opening frame. You will need to have the rear window removed. As far as paint and materials, expext to spend easily 2-3 hundred bucks by the time you get everything. Bill