This first part of the Documentation will guide you through Blender downloading, installing and, if you elect to download the sources, building.
Blender exhibits a very peculiar interface, higly optimized for 3D graphics production. this might look hard to the new user, at the beginning, but will prove its strength in the long run. You are higlyrecommended to read the the chapter called 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, the chapter called Your first animation in 30 minutes, will also let you have a glimpse of Blender capabilities. Of course Blender can do much more than that, but that is just a quick start.