How to create freelancer website

Well, Hello in the first place. I want to create a website similar to elance.com or freelance.com in my country ( as there’s no freelance website) i thought wordpress would nice and easy to set up everything. I pretty much know that i need registration form plugin, profile editor plugin and stuff like that but i just can’t find a proper auction plugin, where other people would create their own auction ( i mean where people can post their jobs), so can you please help me a little bit?