IP Address Scheme

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http://serverfault.com – I am trying to get my head around IP Addressing and subnetting, I have to develop an IP Scheme and implement it for a system with 2 offices and 3 routers, router 1 is connected to the internet and has a serial interface connection to router 2 which is a router that has two networks on one for 300 host and one for a total of 5 hosts. The second router is connnected via serial to router 3 which is located in another office with a total of 70 host on board. Now say I have the IP Address this is the IP between router 2 and router 1, how do I work out the subnet from this? (HowTos)