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.
Verify the details of the cake as well as its cost.
First, have a budget in mind!  What I mean by that, is that you should have a general idea of what you want to spend or can afford to spend on your cake.  I get that for most people, they have no idea what a wedding cake costs, but it helps to get comfortable with the fact that a wedding cake for 100 will start around $6 per serving.  Well maybe it will be less if you get your cake from Costco, (no dig on Costco, I love that store!), but seriously, this is a definite case of “you get what you pay for”.
Another way to save money on your cake is to skip an outer layer of frosting. Naked cakes are not only gorgeous to look at, they're actually pretty practical too. They're a lot less expensive because they use less buttercream and take less time—it's as simple as that. To make up for the lack of frosting on the outside, up the wow factor on the inside by experimenting with unique flavors and fillings, like lemon curd, champagne buttercream or chocolate ganache with toasted almonds.
Sheet Wedding Cakes – A full-size sheet cake typically feeds about 108 people. The cost at your local grocery store or warehouse discount store of a full-size sheet cake will be about $50. A 100 tiered cake would be a combined 3-tier cake. Going by the formula above, you professional wedding cake would be a minimum of $150 for 100 people. But let’s be real. Depending on what you want most professional wedding cake bakers will charge more than $1.50 per slice just for the sheer time to bake and frost a 3-tier cake.
First, add any decoration that will be easier to do while the tiers are separate, such as adding ribbon to the bottom or decorating the sides. Then, using a sharp knife, cut three to five pieces of plastic dowel rod to the height of your frosted tier. Arrange these in a circle in the center of the cake to provide support for the tier that will go on top of it.
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. 
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