Hey sut1576. Bad news first, the os does not yet allow the customization of notification and text tones. Just ringtones. As for facebook chat, as long as you linked ur facebook account to ur phone already u will have the ability to chat. Just go to the messaging hub and slide over to online. After that just set ur status (availabe, busy, away, appear offline, and online) and it should show you to see whose online and allow u to chat with them.
Hope that helped.
10-02-2011 09:11 PM