Now that you've got a content management system, a member forum and and membership registration, payment and login set up, you can decide whether or not to add a classifieds section.

A classifieds section can be for jobs, things for sale, events etc. and a little out-of-the-box thinking might yield a new way for you to use a classifieds section.

Again, this is just a one click install of FREE software from your good ole host Hostgator. I've used both Noah's Ads and AdsManager for Joomla!. I prefer Noah's look and feel, but like AdsManager for it's functionality. You will have to make a decision on which one you like. You can even venture out and find a paid version if the FREE one's are not good enough.