Stupid Exchange Sever question. Basic setup

What makes exchange server work?
How or were do you configure it to connect to your hosting account.
Do you need a static IP for your exchange server?

So you have a hosting account that gives you your pop and smtp settings. How do you translate that in to Exchange server.

I am a MCP with server 2k3 but want to start playing with exchange. I have a trial install of server and a trial exchange where do i start?
I have the server functioning as a server.

What are the proper steps to get started?