If you want to create a forum,
make out time and study it from google search results.
Ask questions about what you don't understand.
The first thing to do is to get a host company.
They can help you to install and create the forum.
Its easy to create but very difficult to maintain and drive traffic to it.
Take a look at this forum.
I created it in less than an hour
Plus the host company are very good at helping out if you encounter problems.
Its a simple machine software , so its free but the major work is behind the scene.
Take your time and feel free to ask me for help if yu need it.
I will do that for you.
LINK TO MY FORUM