I have a dvd player with the old red/white/yellow outputs. I have a roku with an hdmi output. And I have a tv with inputs labelled "dtv/tv" (looks like a coax outlet, from what I can see), "rgb pc" and "component green( y )/blue(Pb/Cb)/red(Pr/Cr)/white(l)/red(r)". I currently own coax cables, an hdmi cable, and a red/white/yellow composite cable. What else do I need? How do I make these devices all talk to each other?