The most important thing to remember if you suspect someone has suffered from a spinal cord injury is to NEVER MOVE THEM. The exception is if they are in an otherwise life-threatening situation, such as being stuck in a burning car or choking on blood. Otherwise, moving them could only make a bad situation worse. You could cause further injury by jarring bones cartilage disks that are already in a precariously disjointed position.
Here are a few more steps to keep in mind: