0. Assign class members to teams, meet with your team. Get their contact information (at least e-mail, telephone if available).
1. Surf through the HW#3's, look for all use cases that apply to your team. Look for "holes" in our use cases where your team will need to support a task we didn't write down yet. Develop a use case diagram and a class diagram that is specific to your team.
2. Install Eclipse (for Java, or a general distribution that includes Java development support) on your system. Use hand-sketches, drawing tools, or eclipse's GUI interface builder tool to design a user interface for each of your team's use cases. Each use case description should now be supplemented by as many sketches or screenshot samples as are necessary to tell its whole story.
3. Work with your team as needed to produce a combined document describing what you plan to do.