What happens next?

How to load a shotgun
Make sure the safety is on, the chamber unloaded, and the barrel pointed away from you in a safe direction.
This is always the first step when loading or handling any gun. Consult your weapon's instruction manual to locate the safety feature.
Determine what gauge (bore diameter) your shotgun is so you can select the right size shells. Common shotgun sizes are 10 , 12 , 16 , 20 ,.