To get started go to the link below. It has beginner videos.
I would also recommend that your friend stick to the "beginner open play" schedules that you can find in the weekly recreation activity paper that can be found in any rec center.
There are classes, but they fill up quickly. I don't know if a non-resident (with a guest pass) can sign up for them.
Virtual Classroom / Intro to PB Series / Intro to PB / Instructional Program | Pickleball Community Volunteer Group