Can I create a global token or does it already exist, so that I can simply and quickly add our company information to the footer of emails. Right now when I create new emails using system templates, I have to type in our footer information. How can I go about creating a token that can be pulled for emails and landing pages?
You could create a {{my.token}} proper (Rich Text, at the top of your folder hierarchy). But this precise task is more commonly done with a static snippet.
If you check the docs, you'll learn how to create and insert snippets.
It depends a little on the situation whether it's a snippet or token.
There are several threads on this as well as presentations from the Summit from Adam New Waterson and Jeff.