This first part of the documentation will guide you through downloading Blender, installation, and if you elect to download the sources, building.
Blender has a very unusual interface, highly optimized for 3D graphics production. This might look odd to a new user, but will prove its strength in the long run. You are also highly recommended to read Chapter 3, Understanding the interface carefully, both to get familiar with the interface and with the conventions used in the documentation.
The last chapter of this part, Chapter 4, Your first animation in 30 + 30 minutes, will also give you a glimpse of Blender's capabilities. Of course, Blender can do much more than this, but this is just a quick start.