Well, first off, delete the 18 or older. It is a really common misconception that anyone that is not an adult, is an immature person. I know many people who are 13-14 who are probably more mature than a person older than 18. So that's first. Also a good clean skin is good. Go for a business like look. Make sure the posters use correct grammar, and make their titles state what they need. Don't have too many forums! This is one of the key importances. If there are too many forums, it will look as if the forums have no one visiting them! Hopefully you are using vBulletin, because when people see that, they see professionalism