Circulation paper money

As someone who has knows nothing about paper money, what should I look out for in circulation? Now I am not talking about just valuable stuff, but the cool stuff too.

 

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Star notes, interesting serial numbers, older notes, errors... etc. Someone else can fill in the "etc."

 

Paul, you said it all, there is no more etc.

 

Birthday Notes
None of the Fancy Serial number websites ever mention Bday serial numbers.

 

Here.. you can start with these webpages I want to share with you -
http://coolserialnumbers.com/FancySerialNumbers.aspx
http://oldcurrencyvalues.com/Value_Of_Star_Notes.html
http://www.antiquebanknotes.com/Currency-FAQ/Star-Note.aspx
http://mycurrencycollection.com/reference/star-notes/lookup
http://papermoneyguide.com/currency_errors.html