Hello! Good Day!

I have an idea of creating "Free Ads Site" that would contain Advertisements of all categories posted by the needy. What are the resources reqd for me to build up this site. I am new at designing the website. I have chosen this to be the content for my site so as to earn some good traffic. Is it possible for me to create this. What are the subjects I should make my self familiar with. Though not so easy, I shall struggle for it. Please help me.

Thank you!