There are 3 important tips:
1. Walk his talk. He should be applying in his portfolio the strategy his teaching. If he recommended a stock, he should also bought it at the same price as he recommended. A mentor is not thinking of his own gain.
2. Credibility. He proved something in his field. A title can be a measure but not the main consideration. You are trusting your future retirement, it's like asking a Doctor for the right medicine. Check his background.
3. His there all the time. A good example is real estate agents, usually after they get the commissions they disappear. Whether the market is green or red he will never leave you. His focus is not money but serving others.
Looking forward to your successful journey.
P.S. This is an inspiring article written about my journey http://filipinotimes.ae/editors-pick/2015/12/26/the-global-dishwasher-is-now-an-entrepreneur/