Ragosky, The solution depends on what you're looking for.

It's relatively easy to find a dominant mentor if you're willing to sub to him or her to learn...

And it's relatively easy to find a dominant mentor if you've brought your own sub with you for the purpose of demonstration and you and she are comfortable with what may come. Hard for you to safeword on her behalf for example. Can you take that?

What's virtually impossible is to be mentored without providing someone for the dominant to dominate. Mentoring is best done by example. And quite frankly, theoretical discussions in person are even less satisfying (imo) than the equivalent online conversations...