well i would say wether you were doing real people or cartoon characters it's easier to start off with the head first, then you can make the body getting the proportions right, i always find it a lot easier that way round, i would also say you would need a lot of patience and if it dosn't look right the first time, then don't worry because you can always get back to it later, overall the main thing is to just enjoy it, good luck!! conor.