In need of tips for the 800 meter run?

i run the 800 meters 4 varsity but I need a little bit of help with it. When i run it am i suppose 2 sprint that first 100 meters but not at full speed cuz im in between a jog and sprint on d first 100. My coach says to not get too far behind but i kind of do cuz i started out not sprinting d 1st 100. But when i did it d first time i ran d 100 i was in d top 5 but at d end i was in last place i think. If u run d 800 for varsity n u r really good at it i'd appreciate ur tips. N my time i last ran it was a 2:23. I know its not d best but it is dropping slowly and steadily