[Buisness] Anyone with ISP experience?

Hello everyone so i was here doing a discussion with my brother and some friends about possible buisnes in the Technology world either Computer/Software/Networking. So while all of them where going on about Computer repair or simple networking cunsultation buisness, i drop the bomb what about a little ISP buisness? I mean think about the possibilities right? So i did my research and all but left me with a few blanks... Like for example about how much of an investment we are talking if its just for a little community? Like lets say 300 costumers to start with. What hardware/software are we looking at? All the possibilities, all the things you can tell me about this world it will be much appreciated. I know all buisnesses are volatile, so criticism with no constructive feedback please keep it to yourself. Other than that thanks for taking your time and helping me out.

-Alexis