Ok im not an expert.......
but i have made a couple of short films.
If you buy a pc and it doesnt allready have a dvd writer then you can replace this with one of your dc drives fairly easily.
I use Pinnacle Studio 8 to edit with althought you can probably pick up version 9 for the same price now.
Personally i have trouble copying the final product to dvd with pinnacle as it takes up to 2 hours for about 30 mins....so i make a dvd movie file usually mpeg and then use other software to actually make the dvd menu`s and burn it to dvd.
I have bieng using Ulead DVD movie factory 2 which is ok, but if you want to go into more detail with you menu`s then i`d go for dvd-lab!
Hope that may be of some help if you have any questions just post back!