Sorry, I don't mean to be tough on you, I know you are under enough pressure already. Buy a Taber's. It will be worth every penny! Also see if you can make copies of the orders and take them home with you so you can become familiar with the most basic terms. If you do this be careful of confidentiality.
I&O = intake and output. Learn these quick or you will become familiar with the term "Nurses eat their own". You will be eaten alive!!! Don't you have a Taber's (http://www.tabers.com) 2nd year of a ADN or BSN program???