Email & Exchange

I my office we just set up Microsoft Small Business Server 2003, and it includes Exchange. I am in need of what issues I need to be aware of as I redirect my email to my Exchange server from DreamHost. We are going to continue to host our website here. Is there an easy way to change the DNS for Email only so that it will point to my exchange server? I see in the control panel that i can deactivate email, but I’m not sure if that will accomplish what I want to do.

Any direction would be greatly appreciated.

I have a good understanding of this stuff, but Exchange is a new beast to me.

Thanks in advance