That said, in such a short event, a fair deal of power is required. Thus, doing short hill sprints (from 60-200m) in the months prior to your attempt would be helpful. Be careful to introduce these slowly. Start with only two, and work up to, say, eight over a period of as many weeks.
Finally, interval work is crucial, although one has to be very careful -- too much too soon, and injury is basically guaranteed. Focus on workouts with rest time greater than or equal to your work, like 4-5x400m or 6x200m. You could do one workout a week.
My favorite book is Healthy Intelligent Training by Keith Livingstone. It's an incredible resource. Also, there's a ton of theory on 800m training in the following thread
http://www.letsrun.com/forum/flat_read.php?thread=2669719
Lastly (and most importantly!), get a coach. Good luck to you.