I take it that you have never done production sound before.
First, it's all about capturing the dialog as cleanly as possible.
Second, unless your director/producer is a sound "fanatic" you'll get all of two minutes to get set before they are ready to shoot, so you won't have time to adjust a whole lot of gear. At the low/no/micro budget level you are going to be doing a fair amount of "run & gun" so you have to be mobile.
Third, production sound should be recorded raw - no compression, no limiting, no EQ - so you can leave all that stuff at home. Also, you will probably not have electricity when you shoot outdoors.
Production sound for film/video is a completely different gig than working in the studio or performing on stage. The key, unless you're working on a "Hollywood" budget, is K.I.S.S. - Keep It Simple, Stupid. With only two exceptions all of my low/no/micro budget shoots have been one or two mics into a field mixer fed directly to the camera.
The production sound kit I usually use is:
Sennheiser MKH-416 shotgun mic (outdoors)
Sennheiser MKH-40 condenser mic (indoors)
Sound Devices 302 mixer (fed directly to the camera)
Two (2) Audio-Technica 1820 series wireless receiver/transmitters with Countryman B-6 lavs
K-Tek wired boom-pole
Plus all of the cases, cables, shockmounts, extra batteries, etc.
The whole job is to get the cleanest dialog possible while staying out of the frame, so you have to boom and mix on the fly as the scene unfolds. You may want to check out the following resources on production sound:
http://filmmakeriq.com/production/audio/anatomy-of-an-audio-bag.html
filmsound.org
jwsound.net
http://groups.google.com/group/rec.arts.movies.production.sound/topics?hl=en
http://www.equipmentemporium.com/