Begin with your topic sentence. Simple. "This is how to plan a surprise party for your boyfriend." Then, write a sentence or two for each step in the process. You could Say: "Begin by writing down your party ideas. Then, create a theme for the party, based on your boyfriend's favorite things." "After that, make a list of people to invite, and send out invitations." Just continue writing like this, and you will be doing what you are asked to do. Good luck with your paper, and if you have a rough draft of anything written, please post in a new thread and we are happy to help!