I Love Wifi Internet Access and its really a Nice Project for anyone to start. I advice targeting a particular locality in Lagos eg V I, Ikeja. And then concentrating on delivering a reliable and affordable service to them. Also consider Automating the means of Paying for your service such as setting up a website where customers purchase Airtime and that means integrating a payment solution like VTN or Other
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Thanks Vicky.
That's some solid advice

why ikeja and V.I. these are cities where companies are located and they all have internet services that they may be comfortable with or would be willingly to pay an extra bucks for extra speed. why not target the suburbs such as Festac and Okota (yahoo yahoo town) sincerely the combination of both town i.e Festac and Okota use about 65% of bandwidth in the country (facts from conversation with existing ISPs). you can try oshodi and orile too (large population)