How to approach a potential mentor...?

[Horacio Cruz Trujano]

I have been putting off this call for the longest time. (6months) Backstory Before graduating high school I was introduced to a real estate broker that has over 35 years of experience by my counselor. We met at his brokerage and we talked for a while, after all was said and done he told me if I ever needed anything or had any questions I can give him a call. Now I have a potential deal and I want to get his help but I don't know how to approach him. How should I start the conversation from a phone call to set up a meeting? I have let two other deals die down because I haven't haven't looked for help. I have asked on BP but I feel like I need some one on one help to be more committed. Anything helps.