Starting project! Metal repair help!

As previously stated, gently work the lines as well defined as you can get them with a hammer and dolly. Once you think you're close enough, run a piece of masking tape along the top or bottom of your body line then do you filler on the opposite side of the tape line. So, if you put the tape to the top of your body line, put your filler up to the bottom of your tape line and work your filler with 80 grit paper on a long sanding board, working up towards you tape line. Once the bottom is to your satisfaction, remove the tape then tape the line on top of your just finished filler, and do your next batch of filler to the top of the tape. Again, work it with 80 grit on a long board until you can really see the line the way you want it. Spray on 2 or three coats of high build 2K primer, let it dry, then lightly fog on some fast dry sanding primer in a contrasting color. Once that's dry, sand very lightly with 180 grit on your long board to get rid of the highs and spot any lows. Keep doing this until your lines are sharp and crisp. Good luck.