You should use a recipe specifically designed to be a wedding cake as it will ensure that it is sturdy enough and that it makes the right amount of batter and icing. For a three-tier cake, you need to make three cakes of 12", 9" and 6", as well as a massive amount of icing. Most three-tier cake recipes have a step-by-step schedule for when you will need to bake and assemble each part.
Will a faux cake or a faux tier save you money on your wedding cake?  I’m sorry to say, but the answer is no.  It seems like having a chunk of Styrofoam vs. a piece of delicious cake should cost less.  I know logically, it sounds like it should.  So in an effort to dispel that myth, I will explain why it’s not the case.  A faux tier, or cake dummy, as we call them, costs about the same it does to bake the actual cake.  So, no cost savings there.  Second, I personally find cake dummies more difficult to work with then real cake, so I’m my opinion, it actually takes longer to decorate them then it does real cake.  So the time that it typically takes to decorate can actually be longer, which means, you guessed it, no cost savings there either!
Even in the event you take essentially the most painstaking packaging measures, consuming the top tier of your cake on your first anniversary sounds much better than it tastes. Think about indulging in your two-week or one-month anniversary, and deal with yourself to a fresh cake in the identical taste once you’ve hit the one-year mark. If you should adhere to custom, tightly wrap the cake in plastic wrap, then place it in an hermetic baggie.
The typical style for a modern white wedding is a decorated white layer cake. It is usually coated and decorated with frosting. The layers may be filled with frosting, or other cake fillings. It may be topped by cake decorations made with edible flowers and other edible decorations. A layer cake can be a single cake, or it can be assembled to form a tiered cake. The tiers of the wedding cake can be either separate or together, with fake or real flowers or plastic cake toppers for the top tiers.

In Europe in the 19th century, the cakes baked to serve at the christening of an infant were similar to wedding cakes. Eventually, since the wedding cakes were generally made of fruitcake, which would store well, and because the first baby often arrived within a year or so of the wedding, it became traditional to save the top part of the wedding cake to eat in celebration of the couple's first child.[30] More recently, some people freeze part of the cake and save it until the couple's first wedding anniversary.[30]
Once the marzipan is draped over the cake, gently pull down the sides to cover any gaps. Smooth the flat of your hand down the sides, pressing the marzipan to the cake and amoothing out any creases or overlaps, Rub the flat of your hand or a cake smoother over the top firmly to flatten and smooth the surface. Smooth out the sides in the same way. Trim off any excess marzipan around the bottom of the cake with a sharp knife and peel it off the board. This can be kept in an airtight bag or container for use next time.
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