[H] router setup help

[Winterlight]

I have a Linksys G wireless router setup 192.168.1.x for my LAN. It 
has wireless disabled. Now I plug in a n router into one of the ports 
on the Linksys and set it up at 192.168.5.x  and I enable wireless on 
the n router, and run the router fifty feet away. I not only use the 
wireless  N router but also the ports to plug a PC, BD player, and 
a  TV into. I want the n router, both wireless, and wired to have 
access to the Linksys LAN. Should I disable the firewall on the N 
router, and leave DHCP enabled?
thanks
w