Connect Linksys device to any network port (cable network) using same cable as you use for connection computers to the network.
Then give the Linksys IP, default gateway and DNS. (refer to Linksys's documents)
As for DHCP, if you want only your wirless clients to have DHCP IP then use the DHCP in the Linksys, if you want your Cable network to have DHCP IP then you can use Windows Server 2003 or 2000 as DHCP server.
With proper googling and reading you can do what you asked for easily