Please help me. I need a network infrastructure of a company .

Please help me. I need a network infrastructure of a company:
1. with 3 departments (purchasing, accounting and management)
2.with 10 workstations in all
3.has its own web server
4.has a DNS server
5.uses 3 securities namely: firewall, proxy, and NAT
6. has a log-in server
7. needs firewall configuration
8. number of firewalls used
__________
please help me…