One thing that we've learned from our Amharic tutors is that the way middle-class Americans talk to their children doesn't translate to Amharic. They say that instead of, "Do you want to eat?" or "It's time to take a bath" or "Let's get dressed" we should just say, "Eat!" "Wash!" and "Get dressed!" This definitely helps simplify our language learning.
I've compiled a list of commands / imperatives and posted them here. They're in three columns, depending on if you are talking to a boy, a girl or more than one child. To make a command negative, just add the prefix at- in front of the word.