Hello,
You would like to create your own forum?
There are a lot of modules & services out there.
You can try:
http://www.phpbb.com/
Here are 9 alternative to phpbb:
http://www.mitchelaneous.com/2010/05/31 ... ernatives/
Joomla Forum extensions:
http://extensions.joomla.org/extensions ... tion/forum
You are using WordPress?
http://chasesagum.com/5-best-choices-fo ... um-plugins
This forum is build on phpbb and well, it is okay to use it. They had lot of issue with spam, but with latest version, they seems to fixed it.
phpbb is probably the most common forum out there. It is free and easy to install.