Too many questions and too little time, would be far better and more entertaining over a beer...............with a good cigar.......
Den hunting - denning is generally in the spring when they have pups. Other times they will stay in the area, but rarely use the den, and depending on density of population, usually in MN I have found that is within a 4-6 square mile area for a breeding pair. That is not to say that there are not overlaps in territories, as well as usually the younger Yotes less that 1 year will generally stay within that territory too. Usually in the spring is about the time that I quit hunting, just to let next years targets survive with both parents.
Calling - usually calling for me is about 30 minutes per set-up. If there is no action or calling back and something does not start within that period, they may not be in that area until later in the day. I will move about a section or two to the next set up, as it takes time to get from the vehicle to the set-up spot, usually about 30-45 minutes. It is not usually good to go to an area that you have not previously scouted, mapped, and located animals on other trips, however yes you can often get help from locals or farmers to give you a jump and area to start.
Permission - I have a standard permission form that I fill out and both the land owner and I retain a copy. It has my name, address, phoe, vehicle description and a release of liability clause for the landowner. If you get permission and go onto a landowners property and are successful, later at some point he will "recommend" you to his neighbours. But getting that first time permission is sometimes difficult. I clearly tell them that I am only there to hunt varmints and that I will leave his property in exactly the way I found it or better. I carry a pack with a bunch of stuff in it and one year a landowner said that I could hunt only in the back section. So I honoured his request and on the way out I found a fence gate that had fallen apart. Well after calling for a while I ended up shooting two Coyotes and on the way back fixed his fence. Two months later I called him and asked if I could come back, he approved. Well I go to their homestead about 0430 and he and his wife were up. He invited me in and we had frech made apple pie and coffee. During the course of conversation he commented on the two Coyotes, then asked if I had fixed the fence. I told him that I did. Well long story short, here it is 10 years later, I get to hunt on about 15 farmsteads in the area, beause he told his neighbors and they invited me down to hunt Coyotes on their land.
Geeze, enough for now..........and goalie, I don't know for a fact that they can see your finger at 600 yds or even 300, but I do know that with flashing skin accidentally by taking my gloves off at the wrong time that I spooked one at 200 yds....