How can I easily create a website like Fluther without knowing webdesign?

I have a brilliant idea for a website that is similar to Fluther, in that they are both question and answer forums. My idea is much more specific to a single topic.

I want to find out if there is a way to create a web page, that would sufficiently help carry my idea off the ground, yet be relatively simple and quick to learn for someone who doesn’t know a thing about web design.

I run Mac OSX Tiger. I do not however, have a .Mac account and do not plan to get one. The iWeb program integrated with my system requires that account to utilize it’s full potential. I would consider it to be ideal if I were able to use a Mac friendly program, but also have as much experience using windows based programs.

Thank you for any helpful ideas.

Sincerely,
Allison