Glad you asked before buying one. Yes, they require considerably more maintenance than a house plant, some more than others. In fact, a bonsai is not really a house plant. It is a living work of art. However, if properly cared for, some species will last hundreds of years.
Where do you live? Google on Bonsai Clubs International or American Bonsai Society. They have lists of clubs. Find your nearest bonsai club. They will help you find the easiest bonsai to care for in your location, & will teach you what to do with it.
If you have any specific questions, write again.
Iris