apt-get tut

[Ray Percival]

Does anyone know of a place with good apt-get info? That and a couple of 
questions. How does one find out what packages are out there? I'm looking for 
helix code Gnome 1.2 in particular but would really like general info. Also is 
X 4.x apt-getable and if not how do you do a .deb that is not. Thanks for your 
help.
Ray