Hi. I am a certified personal trainer and I am studying for my health coach certification through the American Council on Exercise. My manual suggests recommending this website to my clients so I am checking it out to see what it is all about. Why are most people here and how do you benefit from being here? Thanks so much for any feedback. 
This forum is great for asking specific questions.
Not sure if there is a good getting started guide. You could watch some of the talks at http://quantifiedself.com/topics/videos/, or perhaps read http://www.amazon.com/Trackers-technology-helping-monitor-improve-ebook/dp/B00QUEZKAA/.
Thank you