29 is stupidly young to be a mentor, but it's a great moment to start working on helping others in your field of expertise.
I think HN is not a place for that kind of posts. It's a place for people like you to post about their incentives to help the world (and succeed in the process), thanks to what they achieved in their field of expertise. Otherwise, just open a blog.
Where do you think I should start? How do you think I should improve my mentoring skills?
The most obvious would be "write a blog". But to be honnest, you may as well use your knowledge in the process of building a tool to share it :)
Here comes the engineer approach : List your knowledge, structure it, and think about how people would like to get access to what you have to offer. You might come pretty close to what Khan has done with http://www.khanacademy.org/
Feel free to contact me (nsebban at google's mail thingie) if you want to talk about this topic in more details...