John,
As Grant noted, you want to connect to the Net using either your built-in modem if you only have a dialup service or via your Ethernet port if you have a cable modem or a DSL modem.
The USB and FireWire cards are used for peripherals...printers, HDs, optical burners, etc. FireWire is the high-speed connection to use for HDs and burners; USB 1.1 is fine for printers, mouse, external keyboard, etc.
If you open your Extensions Mananger, see if you have these extensions:
USB Mass Storage Extension
USB Support
USB Mass Storage Support
USB Software Locator
USB Device Extension
If the above are not present, I recommend you download this USB extension package from OWC; they assembled various version numbers of the Apple USB extensions to correct a problem OS 9.2.2 has with USB PC cards. Just copy this link into your address bar of your browser window, then hit 'enter':
http://eshop.macsales.com/tech/ftp/usb/usbextensions.sit
A file titled 'usbextensions.sit' will appear on your desktop assuming you have set the browser to download files to your desktop. Double-click the file to decompress it and you will have a folder on the desktop with these extensions:
USB Support v1.4.1
USB Software Locator v1.5.6
USB Device Extension v1.5.6
USB Mass Storage Support v2.0.4
USB Mass Storage Extension v2.0.4
Highlight all five extensions, then drag them on top of the closed System Folder icon; they will be automatically installed in the Extensions folder. Before restarting, go to Apple menu > Control Panels > Energy Saver > Advanced Settings and uncheck 'Allow Processor Cycling' for •BOTH• the power adapter and battery. If not unchecked, the powerbook will freeze with a USB PC card.
Now restart to make the USB extensions active. Insert the USB/FireWire PC card; you should see a USB and/or FireWire PC card icon on the desktop. Connect a USB mouse and test the USB PC card.
If no desktop USB and/or FireWire PC card icon appears, make sure the PC card is fully inserted. You may have to place a hand on the side of the powerbook opposite the PC card slot so you can push hard. If the card fails to seat, the card slot may be in the locked position. Push an opened paperclip into the small hole next to the slot to unlock, then try the card again.
http://docs.info.apple.com/article.html?artnum=16167
Regarding FireWire: You need these three extensions for a PC card:
FireWire CardBus Enabler
FireWire Enabler
FireWire Support
The easiest way to install these extensions, at least at this point, is to download FireWire 2.5:
http://docs.info.apple.com/article.html?artnum=58642
Once you have expanded the file, drag the three extensions on top of the closed System Folder icon, then restart.
Regarding the Extensions Manager: A - (minus) sign in the box next to Control Panels means some extensions are not turned on. A + (plus) in a box means the extension is active (loading) at startup.