Help! I bit off more than I can chew! Body work

took off my top and found a little rust not too bad i dont think. started sanding on an area around my trunk and found an inch of filler and a weld from the trunk to back door. any ideas as to how to fix this would be great. thanks. hope the pics help. also got the wire wheel too close on some trim while getting glue of roof can the sand marks on the trim be buffed out? thanks