To get Windows Movie Maker, you have to download Windows Live Essential.
It is a collection of tools, and Windows Movie Maker is a part of it.
It has several tabs, each contains commands and options organized based on their functions.

If you hover your mouse pointer over a theme, the preview will play automatically.
To get a fancy effect for your movie, go to the Visual Effects tab.
There are more than 20 effects to choose from, each is displayed as a thumbnail.

Afterwards, it’s possible for you to start using Windows Movie Maker.