I grew up using a bolt action shotgun with no magazine (had to load each round with the bolt open, close the bolt, shoot, repeat) and have a special fondness for bolt action shotguns in general. It looks like yours is a .410 like mine was, and may even be the same model (mine was labelled Sears, but Stevens probably made it for them). If so, you can shoot it without a magazine, it will just be a clumsy-action single shot. If yours is a different bore (12, 20, etc.) there are more options as to what you can hunt, but regardless you should be able to enjoy the gun with modern ammunition in whichever bore it is.
Spend a couple late nights just reading the archives here. You'll learn plenty about shotgunning in general. Looks like you have some fun shooting to look forward to.
gp911