Computers on network can't see each other and can't communicate

I have a Linksys router, WRT54G, which calls itself wireless but has only wired connections.   I have my computer and my phone (for Vonage service) plugged into it.    My router is then connected to the household router by a CAT 5 cable.   The household router is also a Linksys; wireless and with plugs for a half dozen computers.   
I get teh Internet fine with no problem, but we want to share my printer on the household network.   My housemate cannot see me on the household network and can't see my router either, and can't communicate with my computer with the \\Name command.   I can't see the household network and can't communicate with my housemate's computer with the \\Name command.   
I am running Windows Firewall.   I am sure that so is my housemate.
Is there something special we have to do to set up our routers for the household network to work properly?
It looks like I'm supposed to configure my router to communicate with another router instead of connect directly to the Internet, but when I tried htat and enabled interactive adjusting or whatever I suddenly couldn't access the Intenet and my phone couldn't get a dial tone, until I changed it back.
Tehre isn't any explanation of how to do it anywhere.   There aer technical descriptions of what each thing does but I don't see where it says how to set it up or how to troubleshoot.
I don't know if we were supposed to set up networks and manually add each other's computers.  Apparently my housemate did not have to do that with his wife's computer or his notebook.    They just show up in the network.

Thanks for your help.   Unfortunately between when I last looked at your name and when I managed to reply I forgot your name.  
1.  For the option that the parts of the network can see each other, you plug the cable into the OUTGOING port of the SECONDARY router?    That doesn't make a whole lot of sense; how cuold that possibly work?  The way I understand it, the signal can come in only through the incoming plug, which you call the "internet" plug, if I'm understanding you.
2.  If you choose the setup that makes any sense - the cable is plugged into the incoming plug - the "internet" plug - on the secondary router, and the ethernet connection on the primary router, can all the computers see each other and their resources, ie, printers they want to share?
3.  If not, why on earth?
4.  for the second option, it looks like some steps are missing.   Why don't you need to disable DHCP and set the router to be a secondary router?
 PM me for my contact details.
Dora Smith
(Mod note: Edited post for guideline compliance. Email address removed. Use the PM system please. Thanks!)
Message Edited by JOHNDOE_06 on 02-25-2009 08:39 AM

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