I'm a junior in high school and have been asked to coach a freshman basketball team. This team will consist of players who have never played basketball before. Most of them won't know how to shoot, dribble or pass a ball. The won't know any of the rules. I was hoping you could outline what the most import thing to teach first would be. Should I teach shooting then passing then dribbling or what would you suggest? 40minutes will be the most training in a week we shall have. Have you any suggestions or tips to help me? Thanking you in advance.

You have your work cut out for you. Stick with the basics. Here's an article that gives you a good way to combine skills and work on a bunch of things at the same time:
http://www.breakthroughbasketball.com/blog/index.php/coaching-youth-basketball-with-limited-time-1-practice-a-week/