HELP PLEASE!!!!!!!!!?

I need to write a 5 page paper on how nationalism and imperialism lead to the start of WWI i know a lot of it already but I need a little help. How should i structure the essay or which points should i write about in what order. Also what are the most important points that i should write about and include. And one last thing. If you could please send me a link with good information on it i would appriciate it alot. THANKS ALOT FOR THE HELP!!!- Victor DeMaio