This link takes you to a blog that will help you break down each of the essay prompts on the Common App and gives you some great ideas on getting started.  

http://blog.prepscholar.com/common-app-essay-prompts

Below is a power point which introduces you to the Common App prompts and helps you with brainstorming for topics.
 

 https://drive.google.com/open?id=12gGoZ2XaO5swkLh724LErofmXeiLgZQQYScJiAj3BHA