So, I think I have got it now, and thank you to peeps for helping me out so far....
1. So the ip address of the BI PC - 192.168.0.44 - connected to home net - I changed this to 192.168.1.100
2. what is the ip address of your router - 192.168.0.1
3. Attached IP camera (Dahua 5231), and then ran the config tool. I changed the IP address to be static 192.168.1.101
4. Search setting of 192.168.1.1 to 192.168.1.255
5. Opened up IE browser and typed in the IP address of 192.168.1.101 - BOOM opened and can view camera
SOOOOO....Firstly is that correct? Secondly, do I now just simply install all the cameras to the POE switch and set up as above?
I have the VPN router arriving tomorrow (openvpn), which is set up so that I will plug my ISP Modem router, then to the new VPN router, and then to the network. Point being the whole house will be VPN secure.