Internet Fax Server In What Order Do I Have To Order My Network Diagram?

In what order do I have to order my network diagram? - internet fax server

I need a chart to have on the small business attract network, 5 desktop computers, printers, fax, server, hub. And it is a DSL high speed internet.
I do not know what it should be around them, is
1. The server firewall modem DSL Internet? or
2. Server Firewall DSL Modem Internet? or
3. Server firewall router internet? or
4. Server firewall router from the Internet? or what?

What should I use ADSL modem or router or both?

Someone please help me, if you know anything about this ..

Thank you ..