I read that each tier should be on a cake board, but it isn't clear just  how to do it. Does the board have to be covered in foil or do you use the cake board as is? If you use it as is, won't the cardboard get soggy?

AIs this your first making a tiered cake?

I use tuffboards which are corrugated plastic, but you can get waxed cardboard rounds that are moisture resistant.

http://www.wilton.com/cakes/tiered-cakes/stacked-tiered-cake-construction.cfm
 

I've made a few others. I just put the tiers on top of each other. I try to avoid wedding cakes. sometimes I just can't say no. I'm always trying to make the next cake better than the last. So any tips are appreciated. Thank you.