Finding a suitable Mentor is a sensible move but have you considered how good a Mentee you will be?
It is as much (if not more) up to you how much benefit you will gain from this relationship. The more you put into any relationship, the more you will get out of it. The more rapport you build the easier it will become to be honest with each other as you work together.
For instance you may have chosen a Mentor as someone who will hold you accountable, so there will be no point in the relationship if you don’t follow through on any tasks or changes you agree to complete.
It’s a good idea to bring to the table an agenda or a list of items to discuss with your Mentor so you can share the wisdom and experience with someone who has walked the path before. And of course you have to be realistic in your expectations, as a Mentor is not there to do tasks for you, so you would do better to focus on giving feedback on your progress and sharing issues that are holding you back.
To achieve the best outcomes you should always remain open-minded and respect the time you have with your Mentor through punctuality.
The more you share of your vision and the stumbling blocks along the way, the more your Mentor will be able to help you see things from a different perspective.
Keeping notes at your meetings will help you remember the key issues discussed and help you track those things you elect to complete before your next mentoring session.
And, by the way, most Mentors love to receive feedback from their Mentees, especially in the case of unpaid or volunteer Mentors; a show of gratitude goes a long way.