No one is going to laugh at you…cause we have all been there! I don’t put cakes in the fridge. And I don’t usually use ganache first. Just use a crusting buttercream. Bit I think if you are using a buttercream that doesn’t crust, then I think you put it in the fridge before covering with fondant so that it sets. There are some great decorators that have videos posted on youtube that will help you. Edna De La Cruz is awesome. Her webisite is Design Me a Cake. Just watch all the tutorials you can find and decide what you think is the best for you. Start with simple, get comfortable, then begin to add to your skills. Good luck to you, and don’t be afraid to ask questions! I’ve asked some that I know had folks just rolling their eyes.