Display at starting

Hello,

When I launch emacs, I would like it to have three buffers disposed that way:

-----------------------
|.............|.......|
|.............|.......|
|.............|-------|
|.............|.......|
|.............|.......|
-----------------------

and such that the length of the buffer on the left is 72 characters long.

How can I do that?

Thanks!

C-x 3, C-x 2, C-x 1 to make it just one again.. A quick lookup the function is split-window-vertically, split-window-horizontally, and delete-window, delete-other-windows to remove it again. C-x o, other-window, switches window. And there is enlarge-window, enlarge-window-horizontally, hmm, really repeating what the link says here..

Thank you very much, I managed to do what I wanted to do.