I have to make a wedding cake for art cl and I need help.?

So me and a friend have to make a weeding cake for cl. We want 3 tiers and to be white. It has to also appeal to kids so no crazy flavors. I am a very good cook and baker I just never made a wedding cake. So I have some background in making cake but it's limited. We want to make it from scratch no cake boxes. Also we want a European style Cake. I also want to put 3D eatable pieces on the cake like flowers (as seen on the show cake boss) so any ideas on flavor of cake, do different flavors on each tier? How to decorate? Any tips, we will be making a trial cake before we bring the real cake in too school. All help is appreciated thanks.