Need 1000 posts in 100 threads on my website by atleast 50 registered users

We have recently started a general purpose forum website which doesnt have any registered users or posts. I need some approximately 20 threads in 5 different forums. These threads should have at an average 10 posts each and total it should show approximately 50 registered users. So in all work involves, registering 50 times and posting 1000 posts. Waiting for some good prices bids and not to forget that these posts need to look genuine.