Plenty is documented about the benefits of mentoring for the mentee.  Here are some benefits for the mentor.

Staying within the boundaries of the mentoring and coaching role.

Top tips for mentees.  There's plenty of training and support for mentors, but what if you are the mentee?

Effective mentoring. Ten tips for effective practice.good mentoirngring practice.

How to tackle the question: "What do you think I should do?" to enable someone you are mentoring to find the answers within.