First, you must do investment, a lot investment for buy some GPU or ASIC like what first comment says. You need some room (or maybe big room) for your mining equipments like GPU/ASIC/Other and some cooling fan (or something like that, idk) and another thing that you need.
After that, you can set up everything become what you want. See google or browsing on this forum, maybe you will found something important.
Staff? I watch video about mining farm on china, they just have 4 (or maybe 5 , i forget) who just do some small task, like cleaning, checking, and another thing like that. Some reference :
https://www.youtube.com/watch?v=K8kua5B5K3IIf they want to share their experience, its good. You can learn something from them.
Edit : dont forget about electricity cost