Hello everyone. And that's what I got from previous owner of car, not very big dent that start to destroy paint and rust came on it, so I'm pretty upset and understand that should do something with it.
So here is picture of the dent (it's clickable to see in zoom)

IMG_1739.JPG
Zoom version of photo #1 CLICK HERE

IMG_1740.JPG
Zoom version of photo #2CLICK HERE

And here is that I wished to know:

1.How to remove dent ? DIY only, I saw a lot of kits on amazon but don't trust without any reference of specialist.
2. Remove rust ? What kind of sanding I need ?
3.What kind of paintcorrection is better for price/quality.( duplicolor or something else) I know that it's better to repaint whole part but It would cost me a lot. So any suggestion would be appreciated from my side.