Help setting up Webstar Cable Modem internet connection

Okay, i FINALLY have cable internet...and i just realized I don't know how to set it up....i've never been in the situation before...can any of you give me some resources?
.:title edited by dibblethewrecker:.

Okay, I'm using an onboard ethernet NIC.  I tried using the ubuntu live cd, but it won't automagically set up my network either. 
I figured out my LAN card isn't even detected by my router so I'm using onboard NIC for the time being...my router detects that one.
By the way I got a router....it is a LinkSys Wireless-G Broadband Router--model WRT54G.  But I'm not using the wireless portion on it.  My girlfriends computer is hooked up to it with windows, and it connects fine.
I'm still not having much luck.  I went to that cable-modem howto in wiki, followed it to tdlp's DHCP mini-howto...it makes reference to a script called /etc/rc.d/inet...I don't have that one...should I?
I would still appreciate any advice from you guys...thank you in advance.

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