Affiliate Marketing Secrets

I am looking to create a niche website for a specific type of product and group of people. I need it to operate SIMILAR (in some regards) to eBay or Amazon. Namely, people need to be able to fill out a short profile about themselves (which will be used for people to filter searches), and then they can upload their product to sell.
All payments will need to be traceable by the account holder, though it will all be processed through us and paid out monthly.
Is there any kind of software that can do this, or will I have to hire a programmer?