2 network cards on the same pc

I have a network at home between 2 pc and they share files.
The first pc is connected to internet.
How do I configure the gateway and DNS.
The first pc has 2 network card: one for internet and a second connected to the other pc.

First pc
Network card to internet:
IP:192.168.1.1
DNS?
Gateway?

Network card connected to second pc:
IP: 192.168.0.1
DNS:?
Gateway?

Second pc:
IP: 192.168.0.2
DNS?
Gateway?

 

Don't shoot me if I'm wrong but this is how mine is set up...

Main computer (MAIN)
2nd computer (2nd)

main has 2 network cards [one connected to internet (A), one connected to 2nd (B)]
(MAIN) Network Bridge should be manually set up as 192.168.0.1, subnet is automatic (255.255.255.0)
(2nd) Network Bridge should be manually configured as 192.168.0.101, same subnet, Default Gateway 192.168.0.1, DNS Servers should be set at the same as MAIN(A) [194.168.4.100 & 194.168.8.100 is mine]