Online second hand sell webpage

I want to create a webpage where people can sell their old things with a level up system when you buy and sell. It will also have a reputation system. I want the webpage to have more or less the same functionalities as [login to view URL] and i want it to look more or less like [login to view URL] Selling on the webpage will be free except you want it to appear on the featured list or want it to make it more visible. I have a domain for the webpage already but i will have no host until the project has been finished. I would love users to be able to log in through facebook and the level will go up when you buy and sell or post it on facebook. I´m a 21 year old student and I have a very low budget. Im talking of about 80 USD. Please if youre not interested in the quantity offered please don´t apply for the job. I will have no more money available.