1. Internally, I use 192.168.1.x, subnet; as I understand
it, the private BM IP address will be in this range, but the public will
not. Should I change this to 192.168.13.x (I'd rather not do the work,
but if required will do so)?

2. Assuming my present configuration, can someone suggest what the
public NIC's address, the one going to the router, can or should be?