Such good answers from everyone! As a ex-doctor myself I would say that you have to really understand what they need and what they are suffering from. And then have a solution that is appropriate for them.
Then you have to know how to reach them. Do you think a doctor is going to listen to a webinar or read your blog? Not likely in my mind. However if you sponsored a dinner at your local medical county or hospital meeting and gave a live talk - that's a different story.
Growing a practice is a business like any other - yet you have to know HOW to build a practice to be able to help others. Do you? There are issues that are specific to the profession - things that you can and cannot do.
If not I would start with learning what makes the most successful practices successful! Knowing the top 10 strategies that great practices employ would be awesome and building a program around those aspects would be great.
I moved partway through my career to open a practice from scratch right next door to a guy who was going bankrupt and around the corner from one of the biggest practices in town. In 6 years I was able to sell my practice to finance my dreams. I used a combination of tactics that were a bit out of the box and it paid off. If you are creative and have good ideas that will be a help.
One thing about doctors - if you don't know what you are doing they will smell you out. So I would make sure you know your stuff before approaching anyone. :)
If I can help let me know.
Good luck! Sheri