First, congrats on the gig!
Your equipment list looks pretty solid camera wise for video work. I know a lot of other videographers who are fans of shooting on primes, but for documentary work I absolutely love and suggest shooting on your zoom lenses. While doing the interview, zoom in a bit, zoom a little further after a while, then zoom back out. You want to give the editor something to work around and not wind up with a static shot. I'm not talking going crazy with it, but use your intuition. If you haven't ever edited before, it may be a little hard to think in terms of video editing, but simply compose it like you would picture. Medium, Medium Close, and Close up. Then work between them.
Now, with that being said, I highly suggest getting yourself a monitor with focus assist. Ikan has a 7" IPS for around $449 that is absolutely fantastic. Being that you would need to manually focus between zooming in and out, that is going to save your butt quite a bit of time. That's a little on the pricey side if you're only just getting into it though, but it'll be worth it if it's something you stick with.
Pick up some small LED's. Chromo Inc has a 160LED panel on Amazon for $32.00. Grab a couple of those and some reflectors and you can light just about any interview type set you'll ever come across. They're small, light weight, and super cheap to replace if they break. Manfrotto makes a pretty set of LED's that is built quite a bit more rugged, but considering it's $280.00 for a 80LED panel, I'll stick with Chromo.
For audio, I ran a Zoom H4n with an NTG-2 mic for quite some time, and even still use that set up frequently. You won't find better equipment for the price. Having a lav would be ideal, and if you have the money to spare I'd suggest the Sennheisser ew 112-p G3. I've used those for all sorts of documentary work around the world, and they are as durable as they come and sound great. They'll run you about $650 for a set of transceiver and receiver though, so I'd stick with the NTG-2 for the beginning.
As far as camera settings go, it's really up to you. Standard is going to be 24p @ 1080p for just about everything you shoot. I rarely run into anyone shooting a doc in 30p, but just double check the frame rate of the other video guys to make sure you're matching them.
As a rule of thumb, your shutter speed is going to be double your frame rate. Set it to 50 if you're shooting @ 24p, 125 if you're shooting @ 60p, etc.
As far as coloring, I like shooting Neutral, and then adding a bit of saturation and contrast in post. You would change that just as you would change the picture style during Manual shooting. You'll hear a few people tell you to download Technicolor Cinestyle, but I'd suggest against it unless you really feel like getting deep into color grading, or if you're directly told to.
Hope that's at least a little helpful. Feel free to ask any more questions you have and I'm sure there will be someone here who can answer.
