First, choose a couple of topics on which you feel you have thorough knowledge, abiding interest, and a deep passion. Source books, activities, course outlines, etc. Now, assuming you were to run it for a corporate setting, align your inputs with the course outline. Ensure there is sufficient theory, ample practical exercises, and games to reinforce learning. Make sure you have enough material to last the whole day. You may need to plan exercise sheets, arrange for props, etc. If possible, have a PowerPoint presentation prepared on the subject to serve as the backbone of the program.
Ideally, try out the program with colleges, social service clubs, etc., to build confidence and become familiar with the material.
It would be immensely helpful to attend a couple of training programs led by well-known faculty to understand how training is structured and delivered. However, be cautious not to outright copy their style but to develop your own.
If interested, you are also welcome to read the following inspirational and motivational blogs listed below, which may contain content useful for your training:
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www.actspot.wordpress.com - Daily Blog
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www.poweract.blogspot.com - Weekly Blog
Best Wishes