Configuring an Unlocked Phone for the Cingular Network

Hey everyone,

I just recieved an unlocked KRZR K1, and I love the phone.
However, I am brand new to this type of thing, and thus don't know what I need to do to configure it to match up with cingular.

For instance:
How do I get it so the 1 button is a speed dial to voice mail?
How do I set up the internet to go to the medianet?
How do I get my phone to work with AIM?
How do I change the address that the Google menu icon directs me to so it will work with cingular's internet service?

Is there anything else, like MMS, that I need to change in order to get the phone to work with cingular?

Thank you!