I am trying to get started using the Amazon EC2 for parametric analysis. I've created an account and two users and a group. Now I am trying to set the policies for the group using the Visual editor. There are so many options to sort through. If I select all EC2 policies I get a bunch of warnings that something else needs to be invoked. When I review all the individual policies I have no idea which ones to select for running OpenStudio an EC2. Is there a beginners' guide for setting up EC2 for OpenStudio?