My 9 year old son recently fell off our coffee table and dislocated his shoulder. I took him to the emergency room and it was put back in place and he was put into a sling.  What can I expect from here on out?  

The standard treatment for a shoulder dislocation from a trauma like falling on an outstretched arm is a period of immobilization (4-6wks) followed by physical therapy for gradual strengthening and return to function.  Surgery is only considered if the dislocation should happen again or if there was a tear of the capsule or rotator cuff in the shoulder as result of the fall.