I am making a cake for a friends, daughters birthday Sunday. It's Friday now and I just carved Hello Kitty's head. I plan covering it in fondant but should I do that the night before? Or what? Do I ice it now, or wait? And do I keep the  Head in the fridge? I put it in an air tight container for now... Please help 

you can cover it now--no worries--keep it at room temperature after fondanting --not sealed tight

Should I cover with Decorating icing or buttercream?

what's the difference

do you mean royal or american?

either

i use a microplane and shave my rkt so it's smooth enough for fondant without icing

Should I ice it in decorating icing or buttercream?

ASorry I posted twice. Thank you so much! I'm new to this and I am loving it do far! :) I appreciate your help