How to fix this interior paint

[Nima]

Hey everybody:
I hope everybody is having good weekend. My wife doesn't want to ride in my truck because it looks old and worn down!. Well, I guess she is entitle to her opinion but I thought if I clean up my truck she may change her mind. Besides, my truck needs more attention anyways. It is my hobby too, therefore lets kill few birds with one stone!. Ok, I got a little side track! sorry. The point is, I can't take my truck to body shop at this point because of the cost. I thought you guys give me some easy and low cost ideas how to fix this interior paint. I was thinking just sand it, prime it and paint it with spray paint from Brothers. It this practical idea? if yes, give me some material info since I don't know anything about painting ( sand material, primers, etc). If no, plaese give me your input in regard how to fix it.
By the way, I didn't know if I should post this thread here or at paint section.
Thanks for all inputs. Nima