Hole tutorials

Hello.
I try to make a exact hole at the wall like this on and extrude, to fit the rotating apple inside the hole.

http://i1023.photobucket.com/albums/af353/Spender19/Spender2/Skrmavbild2011-05-29kl232421.png

Earlier , I made a cube with subscripts and I think I used Boleans , but can not find this tutorials . I remember I had two objectclass Text / and a Plane , but forget the others.

http://i1023.photobucket.com/albums/af353/Spender19/Skrmavbild2011-03-05kl030832.png

http://i245.photobucket.com/albums/gg42/OnyX_034/Bild1-4.png

You know what I can find what I 'm looking for
Thanks
Karl