If you don’t know your Enneagram type there are many different tests you can take to find out. No Enneagram test is 100% accurate for everyone, but it can be a good place to start.
I’m authorized to offer the short version of the RHETI (Riso-Hudson Enneagram Type Indicator), which you can access here. I’ve found that the RHETI, in combination with my Stance Keyword Comparison Checklist, tends to give good results.
The full RHETI can be purchased here.
My favorite Enneagram books are Personality Types by Riso and Hudson and The Enneagram Made Easy by Elizabeth Wagele and Renee Baron.
There are also many Enneagram websites you can access for more information—including mine, Nine Paths.