The Genius Hour is a wonderful way to do Inquiry Projects with your class. I had the pleasure of seeing it happen in Surrey and I highly recommend it! This link has pretty much everything that you need to get started. Please contact me if I can come help you get this started in your school.
Here is a locally developed lesson package for introducing Inquiry Learning in your classroom: intermediateinquirypackage
Check out Wonderopolis to get ideas for your class.