Need help in setting up Pro Sites properly


So we're all fairly new to wordpress and the multisite system. We're currently trying to get Pro Sites to run properly on our main site We want it to run exactly as and run with a user signup page where the end user selects their domain to get a free site and then some paid subscription options. We've got the multisite running, but need some help getting the Pro Sites plugin working properly and really need a expert who's set this up before to pick the brain of. If there's anyone or anywhere you could point us to to get this set up, it would be GREATLY appreciated.