Additionally, if you can't go in person, I strongly recommend the
Tactical Shotgun training video from the
Gunsite Academy.
Edit: Just remembered, the rifled barrel that came with your package will affect the pattern if used with other than slugs. When shot is used the pattern takes on a figure "8" shape. That might not be a problem when the shotgun is used defensively inside a house, but the only way to be sure is to pattern your shotgun at the range to see how the pattern looks at normal defensive ranges, 7-10 yards.