I have footage that was shoot in 30p. My export options are Upeerfiled first, lower filed first and none (progressive). Since the final result will be dvd which is interlaced, should I choose lower filed first or check none since the orignal footage is 30p?

Choose none (progressive). When it is shown as an interlaced picture it will look identical to the 30p picture. I do this all the time.

Garrett

Use the DVD Architect NTSC Widescreen template. Make sure to disable resample on all your clips. You won't see a difference in the footage, and DVDA won't have to recompress.

(Well, I assume it's widescreen. If not, don't use the Widescreen template. :) )