Hi
First of all I would urge you to work on your communication skills which is the backbone of any training program. The heart and brains of the training still remains the domain knowledge but even the most knowledgeable person would fail miserably as a trainer with out effective communications skills. If you are good communicator particularly a good public speaker, half your problem is solved. To further improve your public speaking skills find a local Toastmasters club in your city and join them.
To get the academic inputs on training you can do the course from Indian Society for Training and Development (ISTD) which is headquartered in Delhi. Alternatively you can also attend some Train The Trainer (TTT) programs offered by private institutions. I would also suggest that you attend some good training programs to learn and assimilate the various styles, methods and nuances of training.
Focus on those topics that you are familiar with, confident about, passionate about or have a good grounding in. Keep updating yourself by reading extensively and start outlining the broad course contents keeping in mind the type of audience you are likely to address. In particular pay attention to the type of exercise, examples, activities that you will use during the program to reinforce a point or make the learning relevant.
Ideally begin by taking a few sessions for post graduate students in colleges or for social service clubs like Lions and Rotary's so that you gain in experience and also can fine tune your material. Once you are confident, approach a few corporates and the first few training programs are vital for future reference and for your own confidence.
I would also invite you to visit the following Inspirational and Motivational Blogs
www.actspot.wordpress.com - Over 77,000 views and 550 followers
www.poweract.blogspot.com - Over 22,000 views and 160 followers
Best Wishes