There are a lot of things to do wrong and a lot of things to do right. The most important IMO is to not do what everyone else is doing. Nowadays there are just a handful of popular forum systems out there (vBulletin, phpBB, etc). All forums are being powered by the same systems and have the exact same features and operate the exact same way. So come up with a unique gimmick and distance yourself.
When DaniWeb started, the big thing was to have niche sites that united everyone on a single, particular topic ... such as a forum exclusively for everything Windows Vista or a car enthusiasts forum for everything Acura. What made us unique was that we were one of the only ones to figure out a way to put the convenience of everything under one roof without the site feeling like it has no direction and is just a mosh of random topics.
You mentioned legal trouble ... is there anything specific you're worried about potentially happening that you want to protect yourself from? Check out DaniWeb's AUP and Privacy Policy (links in footer and on registration page) and check out the AUPs of other forums as well. Find what you like about each one and piece together what works best for you.
At the very least, include something about how you're not responsible for harmful posts (i.e. defamatory posts). Some online communities choose to allow users to retain the rights to all content that they post while others, like DaniWeb, assume ownership of all content submitted to us. Research the benefits of each and find what works best for you.
cscgal
The Queen of DaniWeb
19,421 posts since Feb 2002
Reputation Points: 1,474
Solved Threads: 229
I have spoken with creators of their own online social networking sites and all these 3 entrepreneurs told me that they had hundreds of contents and information on their community by the time of launch. One creator told me she had over 300 articles she wrote on her community before launch. Another creator is writing over 1,000 and still is working on launching on their community. I personally have created online communities with almost nothing or little content with the notion - I create and they shall come - well I did have lots of visitors but the bounce rate was very high.
InsightsDigital
Posting Virtuoso
1,761 posts since Jun 2009
Reputation Points: 68
Solved Threads: 9
I would add that a big turn-off to potential members/participants is the tone of the forums. I have gone onto forums and posted questions and because I was not on the same level as the regular posters their attitudes, and responses, ran the full range from dismissive to nasty to completely insulting. Forums like this one are moderated very well and certain behavior and content is not tolerated.
MktgRob
Nearly a Posting Virtuoso
1,294 posts since May 2009
Reputation Points: 18
Solved Threads: 4
I totally agree with you. The tone of the community is created by the members and founder. I am a member of a technology board that every time a member posts a self-promoting link, immediately, other members share their dismay. This helps prevent other future spammy posters.
I also agree that in any online community there are always:
1. The Creators - create content
2. Collectors - share links
3. Lurkers - those who watch but dont contribute.
http://blogs.forrester.com/groundswell/2007/04/forresters_new_.html
InsightsDigital
Posting Virtuoso
1,761 posts since Jun 2009
Reputation Points: 68
Solved Threads: 9