Installing Wi-Fi Hotspot Business

Hey Everyone,
I have been considering starting a business that would install Wi-Fi Hotspots in both residental and commerical locations. I have installed numerous of setups before and i feel comfortable about my work. The system that would be setting up would consist of both free service and pre-paid or pay-on-demand. For the authentication, i have considered using Microsoft’s Windows 2003 Server for RAIDUS Authentication. I was wondering if you guys would have anything to offer concerning this topic? Any information would be greatly apperciated.

Thank You,
ToDi1010