Answer for:

adding wireless router to wired network

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A wireless router is three devices globbed into one:
a wireless access point (AP)
a wired ethernet switch
and a router/firewall.

The router uses the WAN port and sends traffic to both the AP and the (typcially) four wired lan ports. The AP and the switch are layer-2 devices, which mean they have no IP address, and any and all traffic will flow right through them.

Thus if you plug into the LAN port, you are setting up layer-2 access to the AP and the Switch. The router, in this case, does not get to play. However, assuming you already have a router that's a DHCP server, you cannot have two DHCP servers on the network. So you shut that part off.