main blender download site
addons you'll need
put the files in the Blender folder (scripts\addons)
heres a great tutorials
that will show you from the beginning to the end of the process
She teaches you from the start , how to get your blender set up even.
Then step by step how to prepare your mesh and your rigging.
** TOUCH "BROWSE VIDEOS" on the second line, next to "Featured"
and you will see all this lady has made in tutorials**