Low budget film making.

[King of Snake]

From the extra's on the dvd's of the Lord of the Rings trilogy, they did make use of ADR extensively because they were shooting on sets that had everything from jumbo jets taking off to artillery fire! (there's a great bit where Sam and Frodo are acting trough a scene on location next to a NZ army firing range and suddenly you hear this loud bang of an exploding shell).
It's probably not really an option for a low budget movie though.

As for lighting, I would recommend finding someone with experience to cover this aspect of your production if you have no knowledge of it yourself. I managed to get some equipment (lighting, lenses, video monitor, dolly) sponsored by the rental company for my graduation project. You could try this as well, altough I'm not sure if they will do it as readily if you're not in some sort of filmmaking school.

I think the camera you speak of is the Canon XL1 or 2? If so, that's a great camera. I used one on my graduation film as well (owned by a friend of mine). It's a good idea to use it with a decent video monitor on set since it doesn't have an lcd screen. Also you can fit custom lenses on it (like a fisheye) and if you add a mattebox it takes filters as well.

Good luck with your project. I don't know how much experience you have in filmmaking but I can tell you that it can be a pretty daunting undertaking, even for what may appear to be easy and short on paper. Make sure you have people helping out who know what they are doing. Or if they don't, make sure that you do, and can give them appropriate directions! Come to the set prepared with a shotlist, storyboard and script so you can make sure you don't miss any shots and you don't have to think too much about what kind of shots you're going to make (of course, there will be a lot of improvisation going on because conditions on location always differ from how it looks in your head)

I think people can give more specific advice if you provide some more details. What kind of script do you have? How long is it going to be? How many people will be involved (actors, crew). how many locations? What kind of experience do you have already?
It would be great if you could provide a link to the (draft) script online.