To begin, you will want to do the partner sign-up. EVERY PERSON MUST DO THIS AGAIN even if you plan on working with the same partner as you did for P1. Read more about partners here. This application will get you and your partner a repository. In addition to the specification, we've refer you to the same potentially useful handouts we listed for P1:
To request late days on the project, use this application (which will become live as soon as the due date has passed).