Lenses on Nikon D3100?

So I think I'm asking for a Nikon D3100 as my first DSLR and it says it comes with a "18-55mm f/3.5-5.6 AF-S DX VR Nikkor Zoom Lens", but I'm so confused by all of the lenses available, which are compatible, and what's so special about some of them. Is that lens okay for many things? What do all of the details mean? Is it good for landscapes, people, night and day, macro shots, action shots, etc? If not, which lens should I get? What about filters? Can I put those on top of any lens? What "size" should the filters be? What are affordable lenses that are functional and fun? As many details as possible, please.

Added (1). I specifically want a fast (i don't know the technical terms) lens that has background defocus and options for manual or autofocus. Also one that I can apply effects to and one that's fast and good for taking many pictures in a row at parties and with friends or of landscapes or architecture. Also, how can I apply "bokeh" to my pictures? FINALLY, I know I said I've set my mind on this camera, but is this a good quality easy to use entry level DSLR for a 13 year old? From what I've gathered, it is, but I'm open to other options.

The D3100 is a great camera to start with. And before you even think of other things, you may want to master the 18-55mm first.
Buy a copy of "The Nikon D3100 for Dummies " book. It will tell you all you need to know about this camera. I myself bought a book before I did the camera.

A lot of people get confused - that's why Nikon (and just about everybody else) sell kits like this.

The 18-55mm is a good enough lens to get you started.

You should visit a camera shop if you have one near you. They can take the time to explain everything and suggest lenses you should consider for what you want to do.

But please don't take the camera shop's time, then buy it on-line. If the camera shop gives you good advice, you should buy your camera there.

Background blur is as much technique as it is equipment (while not all equipment is capable of this, more equipment is than people realize).

Here is a webpage showing how to create background blur with several different lenses, and even with a compact camera:

http://www.althephoto.com/concepts/selectivefocus.php