How Do I Send an Xbox 360 in to Get Repaired?

Just got the red ring of death, and I dont have a warranty still as I got my xbox back around 2005. I know the cost but I dont know how to go about sending it in to microsoft to get fixed. All info is appreciated

Suggestion:

Either call 1-800-myXbox

or

go online to www.xbox.com/support

Follow the steps for repair request. Have you console serial # on hand to enter.