custom subnet for class c addresses

I am an amature trying to setup custom subnets for 2 networks (IP address 192168.0.0 & 172.16.30). I have 10 machines 1 linux router 2 cisco 2501 routers & 1 cisco 2600 router along w/2 Dlink switches between the 10 machines. I’m confused on how many subnets I will need & how to figure out the physical segments. Please help. 🙂