The better part of any good photograper's trade is timing and discretion. I do not know what the FAA, or government designates private property as, and I think that flying over same at a VERY low altitude plane wise would not be an issue. But since the gummint regulates all things on, over, and under private property, nothing is written in stone.
Photographers have been instantly canonized for just being at the right time and place since photography started. Experience can hone that so one gets more "keeper" photos, but a lot of accidental photos are "legend" photos. And those taken by discreet photograpers are just as good as those taken by photograpers in your face or in the bushes.
What's the gist? For me, I'd just be discreet, time shoots for times when there might be the least resistance, and if you meet with resistance, either state your authority for being there, or retreat and return.
As for what to charge, I would have a day rate for equipment, and an hourly for shooting, prep, and editing. WITH MINIMUMS. Equipment charge would vary due to your particular cost of operation plus something to toss into a fund for when there are costly problems. Standard wear and tear. Hourly on flying, prep, and editing are up to what the going rate is and what you want to make. On the topic of flying ..... that is a special skill that is not cheap. To report with a few thousand dollars of equipment is not cheap, either, and if YOU stuff one, the client isn't going to pay for it.
Some jobs and people will be so easy, you will feel guilty taking the money. Others, you are just trying to finish and get away from it.
Last note ....... personally, within your own head, decide what amount of discount you will have so if someone counters with a lower price, you will know how much you can go, and where the "WE WORK FOR FREE" boundary is.
For me, if it interrupts fishing or nap time, I like to make minimum $100 an hour,