I don't know in which file format Creatoon exports, but most standard video files can be encoded for DVD using this simple (and free) DVD authoring software: http://www.dvdflick.net/
Following standard TV resolutions you should go for either 720x576 (PAL, most parts of Europe) or fuck if i knew for NTSC (as used in the US)
If you're going for HD you should use a resolution of either 1280x720 or 1920x1080 (regardless of Europe or US).
Computerscreens work at 72 DPI, but all you need to know is the overall resolution.
For further info, here some Wikipedia:
Also keep in mind the safe area of the screen (as in - be aware that stuff at the edge of the screen might get cut off)
But as the article says, with the Plasma and LCD screens this is not as critical as it used to be.
I hope this was the kind of information you were looking for.