Which version of premiere do you have? cs4 will have presets for this when you open up a project or sequence, this is just so you have to render as little as possible but does not affect the video quality as far as im aware. for exporting to normal dvd, use the mpeg2 format – CBR 8mbs and high quality – make sure it is set to variable and to keep the export as a single file, select dvd under the multiplexor menu. Blueray is a format i havent played with yet, so cant help you unfortunalty. please let me know if this helps.
Manjeet Gill (Creative Director)
http://www.bsalute.co.uk
Birmingham Salute Media Productins Ltd