What kind of internet access do you want to deliver? High speed or dial-up? Dial-up is easy and I'll explain that if you want.
If you're looking for DSL-like access, you will need to basically be your own phone company as well.
Whatever you do, firewalls, routers, switches, Dslams and Stingers for DSL.....it just really depends on what you want to do.
For your backhaul, you will setup an agreement with a Tier 1 ISP, like Level3, UUNet, GoodNet, AT&T, Sprint, Qwest, etc. You need high bandwidth from your location to theirs; and a T1 will not cut it. Most ISPs have multiple DS3s or faster, plus you also must think of redundancy. Load-balancers, filtering, etc. is easy enough to setup on say Cisco equipment, which I would recommend.
The IP pool you would get from ARIN. They will assign you a block of IPs that you can put into your DHCP pool for users to pull from, so they have a world routable IP address.
Let me know if you want specifics and I'll post.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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