Just started one in our local cricket club weekly to raise cash. It going well and we are generating about a £100 a week now.
If you download this software, you get a 30 day free trial on it so if its a one off, make sure you download with less than 30 days of tourney.
http://www.thetournamentdirector.net/The software is pretty easy to use and self explanitory so give it a blast. Need any help give me a shout.
We start with 8,300 chips each (only cos i have one 500 piece and one 300) and it uses all the chips up. Manage to get up to 30 players in. You can pick up sets pretty cheap tho online.
You would need 27 chips each with 4 different colours to get this done.
Also have a look at this site, lots of useful stuff here....
http://www.homepokertourney.com/