Have you read through all the class prompts yet? If not, don't worry because the Handy Printable Prompts List is up and ready for this month's classes. Stuck for an idea? Check out the Whimsical Class Suggestions over at the Study Hall.
Before you plot out all of your classes you might want to head over to the Forbidden Forest and check out this month's Gryffindor Unity. Getting yourself a crafting partner early on and working out which class you are going to post to will make things much easier. And remember, Unity projects count towards your Slytherin Quest.
...speaking of the Quest, have you turned in May's project list or collage? It's well worth heading over the the Quest thread to see what everyone else has been crafting over the past month too.