That's pretty cool, I don't have TWC but the regular cable in my bedroom hasn't worked in years and the other bedroom in the house never had proper cord, if this had existed in the day that would have been a nice solution to that problem.  Although that will add on to your bandwidth per month.

Roku is a little black box that fits in the palm of your hand. You hook it up to your TV with cables that are supplied. Once you have it hooked up, you go onto Roku and start adding apps that appeal to your nature. Some of the apps will require you to enter a code, which you can do on the Roku site. As far as Private channels, same thing. Most get low grades due to the App being buggy at times. But they usually get them fixed fast enough. Also, some of the really low rated Private Channels are deceptive. They promise you one thing, and then try to get you to shell out your credit cards.

One to the wise, never pay for any of these apps. There is always another app around the corner that will offer you the same thing and usually free of charge. Public Channels are usually the ones that are endorsed by Roku and won't be pulled down anytime soon. The Private Channels is where the fun comes into play. These are User-created apps that circumvent codes for programming that you wouldn't otherwise get to see. This may all sound complicated in the way I'm giving you the info you need, but trust me, it's easy and once you get hooked on Roku, you will ask yourself how you did without it all along.

You have to hook the Roku direct into your TV if you want to see anything on said TV. It depends one which Roku device you get. The older models run off RCA cables and the newer ones offer both RCA and HDMI. I run my PC off a wireless and have the Roku account set up online. Then you have to sync your account with the Roku Box serial number to activate and get it working. After that, it's just find channels you want to add. Some of the channels or Apps are stand alone while others like Plex 'host' a bunch of channels within.

I'm curious how your Roku is set up. The way I have it set up is the way I described above. My internet feed runs off the Router wireless to the computer and then from there I get the feed to my Roku.

Router>Computer>Wireless>Roku>RCA Cables>TV