One guy can easily run all the admin-related stuff, manage tournaments and cash games, run bots, add bonuses and new games etc. etc.
You will however need a serious IT guy to run updates and add features.
We have no idea how long it will take you to break even. It could happen in one day or it could be never. We had days where 2 big players generated over 2 btc in rake, in a single day going at each other at a heads-up table. But then one of them left and we were stuck with people abusing bots and gtd tournaments.
You people are pretty straightforward and genuine in your approach. I wonder why are you not able to turn this fantastic site into a gold mining machine?
I played on your platform and certainly, it is one of the top-notch websites offering online poker experience. Maybe you should go for hourly freerolls like nitrogensports initially to attract regular players with no late registration. Anyway, good luck with your next venture if you are planning any.