You might want to read the synopsis of each episode. Many sites, including Wikipedia go over every detail. It is a very convoluted story and is unlikely to be summed up in a couple of paragraphs:
http://en.wikipedia.org/wiki/Lost_(TV_series)
Thanks for the link, BunnySlippers.
I visited the page, but did not find all the information I was seeking. I was hoping to find more specific info. on the characters.