Wow that is some kind of decorating Chary! That looks really professional.
The only advice I can give you is just do it, experiment and treat it as fun. There a lots of Youtube clips you can look at to give yourself a feel for free. Like how to apply the frosting, how to smooth it, little tips on decorations. You'll see what tools you may need depending on what you want to do.
My mother made wedding cakes when I was really young. I used to watch but never bothered to learn. <kickyourself smiley> Everything I do is self taught over a long time. My cakes are fun. They look homemade and most important they taste homemade. My cakes fall into two categories, the kids themed cakes and general cakes. Every cake is different, each approach is different as I tend to construct the cakes into things like planes, cars, a tank, a soldier, an igloo in the Arctic with an Eskimo fishing - just ask the kids what they want and then use my imagination and somehow it comes together. I use various icings, marzipan and royal icing for 'cementing' things together (sometimes I'll use toothpicks, lollie sticks, even Cinnamon sticks if the item needs extra strength. For some cakes, I will use a variety of cakes together: sponge, devil's food, brownie, etcs. Quite often for chocolate cakes I make a tray of fudge brownie as a base with a chocolate cake on top. Between the layers I may use jam, fruit, frosting, marzipan or a mix. No two cakes are alike, except my carrot cakes. Sometimes the flavours work really well, sometimes they don't work so well. But they always get eaten very quick. Sometimes the design works, sometimes it doesn't but the kids love them. But again the cakes are all home-made and home-decorated and they all taste great.
Just experiment and have fun; there are no rules. Kids will find it fun, adults will find it tasty.
