Can't see an internet cafe as a way to make money, except in extreme examples (e.g. middle of queenstown servicing tourists and transient workers). Don't think there's much demand for gaming rooms now that everyone has broadband at home and can Teamspeak their friends. If you want to do a cafe/catering then do that (although note that it's a hard way to make money and easy way too loose it too)
Regarding the WISP idea, are you looking to service an urban area or rural? Quite different proposition - urban you need to come in cheaper than fixed line, rural more about provider faster connection/more capacity than fixed line. Wireless broadband from Spark/Vodafone has taken some of both off both markets e.g. 4g home broadband for low users in urban areas, and RBI for rural.
I'd suggest starting a micro business serving your neighbours to slowly scale up and learn the networking side of things - e.g. get gigabit fibre at home, figure out which neighbours you can service with P2P wireless or cable (if they share a fence) and go door knocking with an offer they can't refuse e.g. $50 per month for unlimited. Unlimited means that you don't need a billing system. Yes this is a rough way to go about it, but treat it as a learning opportunity that might make you a bit of pocket money, and expand from there.
Which ISP would allow you to re-sell home fibre? Also, what about if they start downloading illegal content?