NIC/Wireless indifferent machines

Ive got a couple of wireless 'blind spots' in my house and therefore
want to move the aeriel.

I had
Cable modem--eth0--router
router--wlan0(192.168.1.1) -> wireless(192..1&2)
router---eth1(192.168.0.10)--hub--192.168.0.1
--192.168.0.2

and when it worked I could access the internet from the wireless &
the LAN

I want to end up with this arrangement

CM--eth0--router
router-eth1--hub--192.168.0.1
192.168.0.2--wlan0 -> wireless

No idea where to start
any keywords I can look up some HOwTos ?

IPs for everything is currently done by DHCP server on the router. Id like
to keep that if possible.
something to do with IPtables perhaps ?
but how do I do the DHCP ?