Carrot cake: what do I need to know?

Help relieve my performance anxiety. My son wants carrot cake for his birthday. I’ve never made it. I don’t think I’ve ever even had any, whether homemade or from a bakery. I have no idea what it tastes like. (Carrots?)

Please fill me in. Should I buy a mix? Order from a supermarket bakery? Other? Anything tricky about it? Does it work best as a frosted layer cake, or a sheet cake, or something more like a loaf?

Do any fresh carrots go into it?

How about those little carroty orange decorations? Can I buy them?