I am attempting to make my first wedding cake for my best friend (talk about pessure), and have no idea where to start! I will most likely be using a buttercream icing and it will be a tiered cake ( but that is all I know for now). I need all the help I can get so anybody with experience please give me some tips, advice, recipes, etc. How do I assemble a tiered cake? What's the best way to transport it? How far in advance can I make it? How long can it sit out? Will I get...