You might check with your provider to see if what you are doing is allowed. You might have to get business service. While you are getting internet to the shop you might be able to free up a phone line that your CC processor users and run that over the internet, or you could even consider VOIP phone service, maybe too risky for a business that relies on the phones and CC so much.
You might want to limit speed to like 20KB/s per MAC address which will mostly prevent people from using the bandwidth to download hundreds of songs (while making it slow for everyone else) - just makes it annoying but still possible, but surfing the web and checking e-mail will not really be noticeably slower.
Personally, I would not run an entirely “open” wireless access point. This means people could be outside of your restaurant using it. You might consider something like a password system based on something that would be printed on the receipt. Or you could just put up a sign inside the store, today’s password is blah blah blah. You don’t want some creep sitting in his car stealing your internet access, right?
At the very least, if you run an entirely open point, make users accept a user agreement (this would pop up when they go to type in any URL in the browser the first time they connect) that says they won’t do anything dumb.
Store computers should not be affected very much. If you have Windows make sure you have passwords (and not “password”) required to login and on any “shares”. You could even segment your work network from the wireless network.
Who knows what the government is REQUIRING you to log by offering this service. :roll:
Maybe I should get into business doing WAPs for businesses.
and you will see more people in your pizza shop