Thx for taking the time to read this and answer my questions.
Same here I'm 15 and I've worked a few times with fondant, but I defientely prefer buttercream. I feel like it definetely tastes better, is easier to color and flavor, and you can do pretty much anything with it.
Charron ^ said something about luster dust. I adore this dust! Its gorgous. I use pink/white/silver to add a little pizzazz to my gumpaste flowers, and its just beautiful. However, you cant mix this into fondant. You can certainly take a small paintbrush and "paint" it on (its not liquid - its like a powder). Or, probably airbrush it, I would suppose? You can probably make the fondant a dark mustardy yellow, then put a nice coat of this luster dust (aka pearl dust) with a paintbruhs and some water, and have a shimmery goldish color.
Pound cakes work best for carving. Just be sure to freeze or at least refrigerate any cakes before carver, it makes it a lot easier and less of a mess. Sponge cakes are okay. I use packaged pound cake mix from betty crocker or duncan hines usually (shh!) but I'm sure any reicpe would work just fine. Also, the cake used to make coffee cakes works AMAZING! I love it. Follow a crumb cake recipe and just leave out the cinnamon if you dont want it to be cinnamony.