Ahhh questions, questions, everywhere. Don't worry. I've been using facebook for a while and I still stare at it blankly, with my mouth hanging agape at least once a month.
Looking at News Feed, News Feed is generally what facebook /thinks/ is important. Based on how many comments/likes are on that particular update.
If you click just above the 'what's on your mind' box, on the 'Live Feed' link, it should change everything to the Live Feed, which is unfiltered and EVERYTHING that EVERYONE on your friends list has posted. once more, all in chronological order, starting with the newest.
My suggestion? If you don't know them, don't add them.
I hope that helped a little bit...if not, I blame the hour. Hahahaha, as if that's an excuse *grin*