Wi-Fi Hotspots

[alunr]

I have been asked by one of my custoemrs to help setup an internet cafe. As part of this I want to setup a Wi-Fi hotspot. Does anyone on here have any knowledge of this? I can do the networking etc no problem but its the charging/various connectivity issues that I'm finding quite problematic.

How will I know if they've been on for more than their 2 hours etc? How can I get staff (relatively untrained) to connect customers (completely untrained ) to our network?

All the internet cafe software about doesn't seem to cover wireless at all.