can't get gnome-session working over SSH

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http://unix.stackexchange.com – I am new to using SSH, so sorry if this question is too rudimentary. To sign into my office computer from my home computer through ssh I go through these two steps: first I login to my office server: ssh myOfficeServerID@myofficeServer then I sign in to my computer using the local IP: ssh myOfficeComputerID@myOfficeComputerIP. I want to be able to view my desktop remotely and work with the GUI. Even when I add a -X flag to SSH, when I run gnome-session it says: ** (gnome-session:12042): WARNING **: Cannot open display: Could any one guide me in how to view my office computer GUI using SSH (HowTos)