Edutopia’s comprehensive PBL guide is worth checking out. 
Included in the guide is tips on:
- Keep It Real with Authentic Products
- Don’t Overlook Soft Skills
- Learn from Big Thinkers
- Use Formative Strategies to Keep Projects on Track
- Gather Feedback — Fast
- Focus on Teamwork
- Track Progress with Digital Tools
- Grow Your Audience
- Do-It-Yourself Professional Development
- Assess Better Together
- BONUS TIP: How to Assemble Your PBL Tool Kit