I'm buying my first DSLR?

The nikon d3100.
i don't want your opinion on it, i'm just asking whether or not you need to buy the extra lenses. It comes with one, right? So i don't need the others because i'm a beginner?

Not to begin with. I'd say use the "kit" lens for a time. Read your book cover to cover, get to know your camera. Learn the relationship between ISO, aperture, shutter speed and light. Learn to control your camera manually and in the other ways that are available. Shoot, shoot and shoot some more. Use the controls, use the camera and all this with the 18-55 lens.

Once you're familiar with the camera and can operate to good technical quality now you're probably ready to invest more money into lenses. However a recommendation here. Buy Nikkor lenses. These are specifically designed for Nikon cameras. The best glass the best function. I use two Canon dslr cameras and I have one third party lens that I now regret buying - it has too many issues.

It depends. For example this Nikon D3100 is sold with a lense: http://www.amazon.com/...B003ZYF3LO

And this seemingly cheaper Nikon D3100 is sold body-only (i.e.without any lenses): http://www.amazon.com/...B004ALFV5Y

Just make sure that you buying the right kit and that should be enough. Later on you can buy more lenses when you learn how to use a DSLR.