You definitely want HDMI from the dvd to the tv, your dvd player won't upscale dvd's without it. For the audio it needs to be optical or DIGITAL coax, the cable looks the same but it needs to be digital coax to get the surround sound to work.
For the cable box the way leftey said will work but what I did was this. Run component cables from the box to the video 2 in on the receiver then run another component cable from the video out on the receiver to the tv. This way if
you end up wanting to hook anything else up, like a game console or vcr, you don't have to run anymore cables to the tv. Just use the other video in's on the receiver and use the video switching on the receiver to change from one source to the next. For the audio it's the same as the dvd player, optical or digital coax from the cable box to the receiver. Not sure why you need the rca cables to the tv unless you want to use its speakers at some point.
That's about it for the connections, either way will work for the cable box. A few other things I'll tell you about though. You will probably have to go into the receiver menu and assign an audio slot to each video and maybe even tell it if it's digital or not. Another thing that had me flustered for a while was not getting a dolby surround option for the dvd, only dolby pro logic which is a "made up" surround sound. It works but not as well as discrete dolby. Turns out you have to go into the dvd menu and in the audio section change PCM to bitstream. I don't know what that's about but as soon as I did it I got the dolby, big difference.
Once you get it working just sit down and play with it while going through the manual and you'll figure it all out. This was the first home theater I did and while it seemed overwhelming at first I caught on pretty quick to most of it.