Internet sharing with 2 NICs

Hello , I have windows server 2008 r2 witn 2 NICs (A) & (B)

-DHCP installed 192.168.1.1 / 255.255.255.0 / GW -none- / DNS 192.168.1.1

NIC (A) is connected by cable to DSL modem that is configured by ISP, so the Ipàs of NIC (A) obtained automatically.

NIC (2) with ip 192.168.1.1 / 255.255.255.0 / GW -none- / DNS 192.168.1.1is connected to my internal network.

Internet access working on server.

All users in my intenal network are laptops, so they are connected to a router TP-link (that is connected to NIC (B))

The main question is how to share internet connection from NIC (A) to NIC (B).

and..

1- NIC (B) has no internet access. (should I install NAT) ?

...if so please what roles in NAT should i configure?

2- Router TP-link should be connected to NIC (B) through WAN port or LAN port ?

....Do I need to connect a switch between NIC (B) and the router ?

3- DHCP on Router TP-link should be disabled ?

Thanks..