There are several things you should consider before you become a beekeeper, but they are no different than if you were to going to begin caring for any other animal ... dogs, cats, chickens or llamas.
First, where will you keep them? Many beginners don't even think beyond their backyards, and that's a good place to start, but don't take bees, backyards, zoning, neighbors and your family for granted. Check them all out first.