Connecting Motorola Cable Modem to TP-Link W8920G - How To

Hi All,

I am fairly new to the whole networking scene,and REALLY need help connecting my Motorola Surfboard Cable Modem (I'm on Telstra Cable Internet) to my TP-Link W8920G ADSL2+ Router. Basically I want to be able to connect my laptop,and my I-mate Ultimate 9502 to the internet,but also be able to access my files through WiFi. Can anybody PLEASE help me? I have a funny feeling that I may not be able to use the W8920G to do this,am I right? Thanks SO MUCH to anybody who takes the time to read my enquiry,and hopefully help me out. I AM GOING INSANE!!! ThanX Again for your Time.