A major part of cabinet and furniture making, and often an area that causes stress to some woodworkers, is cabinet door construction. With a systematic approach, it need not be quite so intimidating. An understanding of the process will change this into "just another phase of woodworking". This article should be quite helpful in explaining how to make cabinet doors.
The first choice in making cabinet doors is pretty obvious, and that would be what type of door / doors do you want on your project. Slab door, meaning a flat panel, generally made from some sort of sheet goods, ie.. Plywood, M.D.F., particle board, and so on. These options are usually covered with some sort of laminate or veneer.