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Hmmmm. Cybercafe at a time people can put thier hand in their hand in thier pocket, bring out thier blackberry and use the internet.
I think the days of internet cafe is over. 300,000 can even buy you three good computers. And three computers can give you good income. Maybe each computer would bring about 1000 naira daily.
I would rather recommend you look for a business that people would surely patronise. Sellling recharge card on the road side would even earn more money than a cafe.

I would suggest you make it a business centre with a few computers attached rather than an internet cafe.