As long as your DSL modem serves out DHCP (IP addresses) you'll be all set. If your modem doesn't serve DHCP, then you'll need a router. Something like a Linksys WRT54 series is a good WiFi enable residential router. You may have issues with double NAT using that setup, but if that is the case your ISP can place the DSL modem into bridge mode and you can DMZ the router. Googling any of that will yield numerous howtos in case you need to do so.
-Jack
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