Connecting to office computer remotely using screen sharing app

How do I connect to my office computer using the screen sharing app in the system?
Are there complete instructions somewhere that I can read?
I have a computer at home and at the office, both with sbcglobal router connections to the internet. I have read that /System/CoreServices/Screen Sharing.app will allow you to connect to computers over the internet, but the article I read did not have much detail.
So say my work router hardware internet address is 123.12.23.123
When the window open after I click Screen Sharing, do I put that address in there?
Is there a port I need to open at the office?
Is there some internet address for my computer besides the sbc 172.12.1.23 address that I should use instead?
Screen sharing has a computer setting under sharing "VNC viewer may control screen with password: abcdefg"
Where do I find more information about Virtual computer networking and how I can do it with my may and the software apple provides.
I appreciate your help.
Message was edited by: James Mol

The only way I have been able to do this is to use logmein.com to access my office computer, then using iChat, accept the invitation to share my office screen. One connected, I can log off logmein.
Has anyone found an easier way?
Thanks

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