General suffixes:
* -ance: Guidance (the act of guiding)
* -er: Guide (a person who guides)
* -ing: Guiding (the act of guiding)
* -less: Guidless (without a guide)
* -ship: Guideship (the position or role of a guide)
More specific suffixes:
* -book: Guidebook (a book that guides)
* -line: Guideline (a rule or principle to follow)
* -post: Guidepost (a marker that helps guide)
* -star: Guidestar (a star used for navigation)
The best suffix to use will depend on the specific meaning you want to convey.