There are some books that are a great help for developing your abilities, specifically intuition, psychic abilities and mediumship abilities. The first one is a great book to have and you can use it with your tarot and oracle decks. In fact, it was written for this very reason anyway and is a great way to learn how to awaken and use your psychic abilities. (we all do have them, I believe, to a certain extent). It is titled: "Psychic Tarot" by Nancy Antenucci and Melanie Howard. Its a very easy to read, use and understand book. I always recommend this book first to people who are interested in developing their abilities. I also adapted some of the exercises in this book to use w/o the cards and had great success. The book is also inexpensive and you should be able to find it online.
The 2nd & 3rd book are by Debra Lynn Katz and are titled, "You Are Psychic" and "Extraordinary Psychic". Again, both of these books are designed to help you, the reader, to develop your psychic abilities. They are also inexpensive books, found online and easy to use and understand.
Now, while this isn't a *human* mentor, it is a great way to develop your abilities and at the only cost of buying the book(s). Plus, some of these could very possibly be used here on A.T. as an exercise--if you set it up that way. and, of course, the "Peeking through the Keyhole" is one exercise that will also help you to develop your abilities. I'll be trying to post more, (one at a time though) to do--so keep posted and participate in them.
Other then that, finding courses in your area are the only other ways I know about that can help you with finding a mentor. But, of course--there is a cost for that and sometimes the cost is high. So, keep looking for those courses and maybe you'll find one that is affordable for you.
there are many other books too--but the ones I mentioned above are my faves from all that I've used so far.