Postpartum questions?

Jasmin💕 • 19. Had a prince(12/11/2015). First time mom.
I'm a first time mom. My son was born 12/11 vaginally. I have a second degree tear and got stitches. When should I expect them to dissolve? Does it hurt for a long time? Why does it burn when I pee still or when I sit down? Can I tear my stitches by moving around a lot?