Kickboxing

Options
I was thinking about getting my husband a punching bag because I think he could get into that. He is totally not the treadmill type like me. Problem is I have no idea how to shop for a punching bag. How do I know what weight to get? Does anyone know of any good dvd workouts to go with it? And what about gloves? Are there any kick-boxers who can help me out?
Thanks!