There are 4 points to remember when performing a spin move:
1) Carry the ball in the outside arm, away from where the defenders are coming from. 2) Slow down when approaching the defender and come to balance. You don't want to run full speed into the defender or else you will get tackled. Slow down and widen your feet. 3) Perform a shake and spin; juke to the outside, and then spin back towards the inside. 4) After spinning accelerate up field.
This video shows the 4 points in motion by LaDainian Tomlinson.