My friend is needing help setting up has dual ISP and he wants 2 network and have them talk like in pic posted. He also has no money to do this but his a some hardware on hand(see list). He would also like to have the wireless working as well. What is the best way to do this and the IP ranges he needs?
Hardware
Two 24 port switches
Two Linksys wrt 54G routers
Two file/backup servers
Building is wired with cat5
EDIT:uploaded image