You've probably also come across "cheers" as used in a bar when everyone toasts. At the end of a letter/email/note, it's a very friendly way of saying "best regards" (of course in business, be careful of being too friendly). It's also used to mean "thankyou" in an informal way.

Yes "Cheers" is an informal way of saying, "Best wishes"or "Kind regards".

yes, you can use cheers as"best regards or see you later.