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 carefully, both to get familiar with the interface and with the conventions used in the Documentation.
The last chapter of this part, Chapter 4, 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.