I have no information on this specific model, but check
The Black & White Darkroom or any book on darkroom use (check your local library) for information on using an enlarger. Note that you'll need a lot more than the enlarger to get anything done -- you'll need paper, various chemicals, trays (or something that serves an equivalent function, like drums), bottles, etc.
Most enlargers are fairly simple in principle -- a light source passes through condensers (large lens-like objects) or a diffusion box (a box that bounces light around) to even it out, then through the film, and finally through a lens to focus it. All this happens in the head, which is mounted to a support (often a single pole) in a way that enables the head to move up and down to change the size of the enlargement. The lens can move up and down to focus. You turn the light on and off for however long you like, either manually or via a timer.
If the light is uneven, it could be that something is blocking part of the light -- a dirty lens, condenser, or diffusion box, for instance; or maybe an insect has died in the innards. You should be able to remove the lens (it unscrews like a lightbulb), and probably at least partly disassemble the head to look for obstructions.