Setting up your client computers on the B network to us the NAT connection method through WinGate would be your best first step. For the client computers to use NAT through WinGate, their default gateway must be set to the WinGate computers IP address, and their DNS settings must be set to a DNS server that can resolve internet domain names (In most cases, this can also be the WinGate computers IP address).
Since you have not used WinGate in a while, you might want to revisit the Installation Guide. This will give you step by step instructions for setting up WinGate and connecting your client computers to the internet through WinGate. The Installation Guide can be downloaded from the following location.
http://downloads.qbik.com/qbiknz2/downl ... nstall.zip