Arrange items in a logical order. For example, you might put them in order from most general to most specific. Or, you might decide it is best to put them in order from newest to oldest - or even best to worst.
Don't hesitate to ask your professor, a graduate assistant for your class, or your liaison librarian for help with your sources and their citations. Get help from the folks at the University Writing Center if you feel like you need writing tips. They are also very good at helping with the big three citation styles (APA, Chicago, MLA).