being a graduated dental surgeon how do i specialise in administration...

As administration is the backbone of any organisation, you will have to make a study of what administration is all about. 

This can be done by accessing matters from the internet. 

There are many administration professional in social networking sites, job sites, who can share their experiences and knowledge. 

Based on that, you can decide if you would like to take courses to enhance your knowledge through training. 

You can even attempt for temporary jobs in administration to get a first hand experience.

All this depends on the kind of experience that you are looking forward to gain.

Before starting your career in administration please do have some courses of management such as executive MBA etc