There is a tutorial under the articals section on how to do a FBCT. Read that then post any additional questions!
http://www.cakecentral.com/article12-How-To-Create-a-Frozen-Buttercream-Transfer.html
No they will be flat, however they will stick up off of the cake a little (unless you do the entire top of the cake) Remember the part on the parchment/wax paper will be the "front" that is the side that you will see. So if you want more dimention I suppose you could pipe some details on top after you have applied the FBCT.
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