I need to know about how much fondant I will need for a two layer cake baked in a 2x12x18 pan. Your help will be greatly appreciated.

This how-to shows you how much fondant (by size) you need to cover your cake:

http://www.pastrywiz.com/wedding/wedding19.htm

This guide shows you how much (by weight) you need for different cake sizes:

http://www.countrykitchensa.com/ckideas/ckIdea.aspx?idea=496&occasion=General%20Cake%20Instructions

http://www.earlenescakes.com/Fondantchart.html

HTH

Thanks so much JanH. You're awesome! This is exactly what I needed. Happy Early Birthday!!