Hi how can you promote a local classified ad site like zamboangaclassifieds.com .Traffic is not that fast
Advertise your local classified site with cheap source in daily news paper or television, even flayers help you to make your site popular.This will help you get noticed to public son they come to advertise their things.it will take some time to see good result, mean while also work on SEO to target your geo location in serps.