is there a link i can go to that will guide me with the hook-up between my TV, Xfinity Cable box and Modem?
The video below should assist.
You could have siimply said to use a cable splitter between the wall outlet and the two devices. Splitters are available at places like Best Buy or online for just a few dollars if one didn't come with your kit. Search for cable splitter or UHF splitter.