Craigs List type classified ad system for my homeowners association website

Hello.? My neighborhood homeowners association has a web site.? I would like a simple system, probably PHP, which would allow homeowners to list personal property they have for sale. The system should operate like Craigslist, only much simpler.? You can use Craigslist as a guide.? We want homeowners to be able to post ads.? However, ONLY the "For Sale" categories will be used.? We will not use communities, personals, forums, or any other categories.? We will not use cities and states, because it is only for one area. The process can be very similar to the one Craigslist uses.? However, it is important not to copy their code or site design so that we do not violate copyright laws.? We do need ads to expire after 30 days and be deleted from the data base.? I would like an email notification to go out to the person stating that their ad is about to expire. Finally, I want the coder to install the system on a site so we can see that it works.? However, the system must be easily installed to other sites as I want to give it to my neighbor's association too. ## Deliverables The final product must be working on my web site.? However, I also require a set of files so that I can easily modify the project for a nearby homeowners association and upload it to their web site.