If you give a good talk, people will come up to you afterward. Get their business cards. A salesperson would call these people leads and follow up with them in order to ask the question directly, "Could your team perform at a higher level with some coaching of the sort I talked about in my talk?"

Your coaching work is probably also going to work it's way into your talk because that's where your anecdotes are coming from. Just make sure to spell it out directly at the end of your talk with a slide: "Thanks for listening, here's what I do, and how to contact me."

There's a non-car-sales technique to selling which is often summarized as give value first. That's what you're doing here because both of these techniques rely on you giving a great talk.