Lets start off with some history:
http://www.badfads.c.../hackysack.html
explains the beggining of hacking, how it started, and how it got its name.
http://www.x-village.../footbags1.html - The most I'mportant utility used to hack, also known as a "footbag". You will definately need to order this in order to succeed, as you cannot hack without it.
After buying the above mentioned "footbag", get a group of friends interested and "keep on hacking ". Eventually you might get good enought to get into the hacky-sack championships:
http://www.footbag.org/worlds2004/
If you are really serious about going in, you will need to know the rules and point system, it can all be found at
http://www.footbag.org/
the official hacky-sack site.
I hope you like my post about hacky-sack, and I hope you become a great hacker!