OK, for your set-up, here's what you will want to do...
You want to use your N router as the modem for the Time Capsule. I'll explain how to set it up so you have two networks in your house.
1. Open AirPort utility, and select you Time Capsule on the right hand side. (If your Time Capsule does not show up, try connecting via Ethernet, or do a hard reset, by pressing the reset button on the back of your Time Capsule, until the light flashes rapidly)
2. Click Manual Setup on the bottom left corner.
3 Make sure the AirPort heading is selected, then click the Time Capsule tab.
4. Insert a name for your TC (This is NOT your SSID), password to access your disks,and check "Set Time Automatically" and make sure the time for your area is correct.
5 Next, go to the Wireless tab, and in Wireless Mode, select "Create a Wireless Network"
6. Select your radio mode, if you want to allow b/g devices to connect to your network, make sure "802.11n (b/g compatible)" is selected, otherwise select "802.11n 5Ghz".
7. Choose a channel, by default this will be channel 1, if there are a lot of wireless networks in your area, choose something more unique, like 3, or 8. (I find 8 works best).
8. Choose your network password, WPA/WPA2 Personal is best. Check "Remember this password in my Keychain"
9. Go to the Access tab, and make sure that MAC address access control is set to not enabled.
10. Now select the Internet heading, and make sure the following information is correct:
CONNECT USING: ETHERNET
CONFIGURE IPv4: USING DHCP
ETHERNET WAN PORT: AUTOMATIC
CONNECTION SHARING: OFF (BRIDGE MODE)
9. Now click Update, and your TC will restart.
10. Turn off your TC (After restart), and connect your USB Hub. Connect all your drives and printer. (You may want to partition your drives in Disk Utility, but this can be done later)
11. Power up your TC, hard drives and printer.
12. Open Air Port Utility, select Manual Setup, and select the Printers tab, make sure your printer shows up next to "USB Printers", then go to the Disks tab, and make sure your disks show up on the right hand pane.
Also, select the File Sharing tab (Under Disks) to set-up your file sharing preferences. I have mine set up to Secure Disks with the TC password. (The password you entered at the start, not your network password, this can be changed in the Airport tab, then Time Capsule tab.)
13. Add your printer to your Mac. Go to System Prefs and click the + icon (If your printer isn't already there)
14. Add your printer to your PC (Instructions
here)
15. Set up Time Machine on all of your Mac's. Go to System Preferences on each of your Mac's, and select Time Machine, then your Time Capsule. Insert your disk password (Not your network password) and hey presto! Automatic back-up activated! It may take a good few hours to back up the entire contents of your Mac - so be patient.
For media set-up. you could stream movies, TV shows, music etc of it from your Mac, but you can't transfer your iTunes Library onto it, if that's what you mean.
Also, you can only access your hard drives connected to your TC when you are connected to the TC, or your N router. You can also do back-ups to your TC when connected to your N router.
(Remember through this process, you shouldn't need to change any of the configuration settings for your N router)
Hope this helps!!