This might be as easy as a link, but a cursory search didn't reveal anything obvious. There's probably several ways to do it in any case.
I've got a project in which I did some colour and mucking about in AE. It's using 32bit colour with no working space/colour management in use (this worked alright for its original destination on the web).
Firstly: what's the set up for keeping the colour right for a PAL DVD finish? (It's been a while. I'll need a YUV/16-235 appropriate space of some sort if memory serves. There's a few to choose from for PAL. Also the timeline will have to be adjusted into the gamut, correct? Any pointers on that would be great).
Secondly I can go straight to an MPEG2 file via media encoder that my authorware won't touch (much. It's Nero. I haven't got Encore or anything fancy). Is that a good idea or is exporting it big and letting the DVD software handle it a better idea?
Feel free to tell me my half knowledge is all wrong.
I'd render the file lossless, and use Adobe Media Encoder make the mpeg 2 file: depending on the length of the video, you ought to be able to take the bitrate right up to the max, 7 MB/sec, continuous bitrate encoding. If you don't have Adobe Media Encoder, you either need to search for it on your machine or get it: it should come bundled with AE.
Failing that, let your authoring software do it. You wouldn't have much of a choice, anyway.