Yes, good questions and allow students to construct something... That's the basics.... The idea is that they need to construct their learning... not just take in information and give it back.
Here is a website which might help you: http://www.intel.com/education/tools/index.htm
At the bottom of the page under Student Curriculum there are listed 4 projects which are case studies of Project Based learning done with the INTEL Teach program. They might help you to understand how this might work... When I finished the course, I put my project into a Moodle class so I could share with other teachers at our district.
Hope that helps.
Paula