If you already have a colour LCD screen in your car, you might be able to easily add a reversing camera, to make parking your car in tight spaces, a doddle. Many manufacturer's offer parking camera's to connect to the screen, and many can be retro-fitted afterwards. Sometimes it can be an easy fit, other times it might require special cable looms, and software programming at your dealer, or specalist. Try seeking advice on Automotive forums, for your brand of car, and there will usually be someone who can offer some advice.
On the other hand, if you do not have a colour screen, you will need to fit one, in addition to your camera. There are quite a few 'Camera & Screen' bundles available, although some can look like a bit of an afterthought. It would be our preffered solution to fashion a fascia and sink your new screen into the dashboard, to provide an original manufacturer look.
Another option, if you do not already have an LCD screen, or cannot connect a camera screen, would be to purchase a compatible aftermarket head unit, which has a colour screen, and is compatible with reversing cameras.