How much would it cost to start open an Internet cafe not including rent of the retail space?

I'd like to open an internet cafe in a 450 square foot retail space by the harbor in a town of 5000 people on the mid coast of Maine. I'm curious as to how much I would have to spend to get it open and how much my expenses would be monthly. I'm thinking of having about 3 or 4 computers and WiFi. Any thoughts would be appreciated.