Netwok Architecture Discussion

hellow my friends,
As we ddecided i have done some researsch on network architecture.I realised that RMO can afford set up LAN over small distances. But in order to set up WAN there is lot of initial cost and maintaince cost as well. I recommed that its better to set up WAN on contract From companies such as AT&T and Sprint.
I will need some suggestions and improvement in Network Architecture Plan.