Cocos2d with Box2d Collision Detection Needed

I have created an app in XCode 5 using cocos2d v2 and Box2d. My app is completely coded and finished besides the collision detection. I need someone who is proficient in cocos2d and box2d. The game is simple, I have a sprite that the player moves by touching the screen and it must dodge enemies coming towards the player. I need the collision to occur whenever the player hits an enemy sprite or the player hits the sand (also a sprite). The collision must be very precise. I need serious offers only. My budget is small and I need help fast. I provided an image of some gameplay to get the basic idea.