Did it come with anything else? Tripod? Film holders? Dark cloth?
The first thing you need to figure out is how to attach it to a tripod. So you'll need a very sturdy tripod, and a head with some sort of quick release plate. I was able to remove the screw handle that came with my quick release plate, and replace it with a flat head bolt that fit the camera base, thereby bolting the quick release plate to the camera.
Once it's up on the tripod you can at least start looking through it. Adjust the aperture to wide open. There is a "button" on the upper right side (if you are looking into the lens) of the lens. Push this to open the shutter. On some lenses the shutter must be cocked first.
You need a dark cloth; something to block out the light around you so you can see the ground glass. I use a home sewn darkcloth of heavy black fabric. My buddy uses a fairly lightproof sweat shirt that he puts on upsidedown; his head is in it, and the camera comes in from the bottom of the shirt.
Once you do this you can see the image on the ground glass. Focus by moving either standard. Stretched out is macro; infinity is close together. It's awesome to look at that huge ground glass and realize that you are seeing the film frame life size.