Asus rt-n56u and Epson r320 Printer

Hey guys,

I've been getting a little overwhelmed with all the research that has gone into my new home network project, so I'm hoping I can just get some direct answers from the pros... (heh, sorry to overwhelm you with the huge post)

My current setup goes - Cable Modem to a new Asus RT-N56U Router, then atm I have my MainPC, an Xbox, and a PS3 wired to that router and an Epson Stylus r320 printer hooked up through USB. Very soon I will somehow add my OldPC into the mix. There is also a Laptop that connects through the wi-fi (g).

The Specs:

The router has the 1.0.1.2 firmware that came with it. Unless there were serious updates/upgrades I'd like to get everything setup with the original firmware before I start messin with stuff.

The MainPC: I'm not sure what the relevant info is here, but it is the main PC I use for everything, including configuring the router. It has the Windows 7 Builder version. I haven't setup Windows Media Center yet (for Xbox?), but I tried to enable some sharing in Windows Media Player. -Not sure it worked. I know I'm connected to a "HomeGroup" and/or "WorkGroup" too, but I don't think that means much for me. -It may actually. It's surfing the internet and the speeds are fine.

The Xbox 360 and PS3 are both wired to the router. I haven't turned the PS3 on since hooking up the new router, but I've downloaded a demo on Xbox fine. -I can also see the MainPC. -Haven't messed with the Media Center here either.

My OldPC could go either way as far as connection, but I haven't hooked it up yet. It's running an "old" version of Windows XP SP 2 that can't be updated. -I'd like to use this PC to stream music, etc through the network. I'd also like to transfer some of the files that are on it to (anywhere really) my MainPC.

The Laptop is really just used for solitaire type games and surfing the net. It has Windows XP all updated (most likely). I'd like to be able to stream from my MainPC or Xbox/PS3 (Netflix) to it. So far I can see the Laptop in the config page of the router, but that's it. -That's a lie! I just found out that I can see my "MainPC" from the Laptop when in the Explorer through "My Entire Network - Microsoft Windows Network - WorkGroup - "MainPC". I was stopped when it asked for a login/PW. I can't find the laptop from the MainPC though. -This is actually huge progress for me. It's on the net fine right now.

Now for the problems... Right now the main problem is the printer. -I can't use it. I can see it on the router config page and it says "Enabled" in ?red?, but that's the only place I can find it. It used to be connected to the Laptop but never to either of the PCs. I've read that the Epson Stylus r320 simply isn't a network printer, but I've also read that's not true. -Either way, would I have to connect it directly to the MainPC to get the drivers?

Next would be the file sharing. I don't even know if the different OS' matter? Can I just share through the router? How would I get it working? I'm really pretty lost here I think.

There is plenty more I want to ask but I feel like I should have stopped a while ago. Thanks a lot for reading this and for whatever progress you can help me make.