Securing Wireless for Internet Access

We are implementing a wireless network for guests. I want the browser to prompt for a username and password but I have never done this. I am doing this to prevent anyone from using our bandwidth just by parking outside the building and connecting. I don't know if the signal is strong enought for that outside, but I want to make sure we are secure. Any tips?

Thanks in advance.

 

Only way to do Browser redirect is by using Hotspot Firmware on a router capable of it. Otherwise, any router out there in the consumer market with the standard Firmware will not do it.

 

Google for the term "Internet caffe" you would get few solutions.