A getafreelancer/craigslist type website

Im trying to setup a website similar to [login to view URL] where people that need to have things done for them such as getting groceries, mowing the lawn, fixing their car, house work, etc... Can log on and post what they need done... Other people can then log on and place bids on the jobs and get paid for doing the job... Initially, i want it to be a free service where both parties work out payment between themselves... However, once it is up and running well, i want all payments to go through the site and i want to charge a small service fee on all transactions... This is a small project to start but will get very complex as the site grows. I would like to work with someone who could handle everything as we grow. A good eye for the graphic design part (design, color scheme, layout, etc) is also very important. Please respond with your bid, any relevant experience working on something like this, and a time frame of how long the project will take. I am looking to start this project by mid to end week.