How do you start gnome?

[Bryan Schmidt <schmidtb calib com>]

    This is probably a stupid question.  I can't start gnome using startx.
After installing the packages I tried exiting FVWM and gnome started.  I
added exec gnome-session to the xinitrc and the Xclients files with no luck.
Gnome is completely new to me.
 
Thanks,
Bryan