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To see notifications, tap on them and go the content. Then, press and hold photo to use your app launcher. Finally, just swipe up to the apps folder.
Chat Heads are the main feature on Facebook Home. When one first shows up, you also get a preview of the message. Thne the Chat Head floats on your screen, and if you go to another app or jump around, the message will still float there.
Tap the Chat Head to start messaging, and when you are done, tap the Chat head again and return to what you were doing. Text messages and Facebook messages both share the Chat Head design so there's no difference between the two.