How can i make a forum on my site is there an ebook for this to help me build a forum?

Forum software such as this one is available from many vendors. Some is free, and some (like this one) is not.

Some free forums:

• PHPBB
• SMF
• YaBB

A couple of pro forums (cost):

• Invision Power Board
• VBulletin

Wikipedia also has a massive Comparison of Internet forum software.

There is no single book that can cover this subject adequately. However each of the software vendors has their own instructions and discussion forums which will help newbies get their boards up and running.

Some, like Invision Power Board, will even install the software for you.

Good luck,

John

If you plan to stay at geocities you can't run server side scripts though. Then you can use a so called remotely hosted service. You find a bunch listed here.
http://hotscripts.com/Remotely_Hosted/Discussion_Boards/