There is a pretty good cost difference between a color and b&w darkroom. Color you need a color head for your enlarger, more precise temperature control, a print processor, the chemestry is more expensive and so is the paper.

B&W is much simplier and less expensive. If you are doing contact prints, you don't even need an enlarger. There are books to tell you what you need. You can also click on the Calumet link above are research there. They have everything you need.