In a home with limited space, a floating shelf can not only give you a lot of storage area, but can also make a room look far larger than it would with conventional shelving.
Typically, floating shelves include a set of brackets that are attached directly to the wall, and then slide-on receiver brackets that are fit to the back of the shelf itself.
Floating shelves are rated to different weight limits, so be sure to purchase the type that will hold enough for your storage needs.
Find the upright studs behind the finished wall. Floating shelves need to be attached into a solid surface. You can use a stud finder, or drill holes until you locate the studs. A small diameter drill bit (1/8-inch) will be fine. Remember, any holes you make will have to be filled, so it may make more sense to use a stud finder.
Mark the bracket location holes with a pencil, checking to make sure that all of the brackets are level. Pre-drill the holes, and install the brackets with heavy screws.
Place the shelf on the top of the bracket receivers. Do not force the shelf down, but lightly tap it into place. You may need to use a small wooden mallet or a block of wood to firmly seat the shelf brackets together.