Let me tack on to what JTP said... What is a good stand? For me, it definitely involves wind movement in the area you hunt. One day... Your location might be great for a stand... and the next, if the wind is moving in a different direction, might be a total waste (and if you use it on that bad day... You might spoil it for later). So what differentiates a good place versus a bad. For me... I prefer to have my sound faced directly into the wind and the wind either coming at me from a forward angle either left or right, or straight on. I have found cross winds tricky (wind moving left to right or vice versa) but doable if you have a gut feeling that there are mutts upwind. Don't waste your time trying downwind dogs until you have a lot of experience. I've known some that can and have pulled it off... But it's a distance game and tricky, dramatically reducing your odds. I make sure the wind is in my favor or I generally pass.
So... Next it comes to vantage. You can't shoot what you can't see. If it's incredibly flat terrain and you have tall brush (like our last outing), it's very difficult to see them coming in or catch movement to identify that they are even there. Yotes, especially seasoned mutts, are perceptive... And their ears, eyes and nose are amped up beyond what we can possibly imagine. This makes them tough opponents. Find a place that gives you decent visibility of possible entries into your stand or of a wide area below where you can see movement as they try coming in to check things out. Use a rangefinder to mark distances for certain points so you know what's shootable without having to grab your range finder in the heat of the moment. This can be done prior to turning on your call.
A good stand will provide you with cover, something that you can use to blend into the environment so that the coyotes will not tag you as a possible threat. It's better to sit in front of your cover than behind it.... Sun at your back is always one of my favorites, but as long as you have good breakup camo, have your face and hands covered, and limit movement, you can be pretty effective with most low positions (sitting or prone) that have any kind of brush, fences, etc that you can saddle up to (just don't pick a spot where your head and torso break the skyline as you'll be busted in a heartbeat).
Note... Your decoy is good to keep interested Yotes, that have come to check out your calls, something to focus on other than you. This allows you to have more options to move around a little more than if you are just using a hand call with no decoy, but don't get too cocky! Mutts have good eyes and even if they are focused on a decoy, if you move too much, they're apt to notice... and then that's it. I try to move or shift as slowly as I can when they are moving, but when they stop... if I'm not taking a shot, I hold pretty much absolutely still, and then move once they start moving again.
Lastly, look for sign, scat, tracks, etc while you are scouting, but don't forget that you can also go out late in the evening and use a siren to howl up mutts and figure out if there are any in the vicinity. If you find a potential stand but aren't sure whether there are dogs there... get about 3/4 to a mile plus away and run a siren call at high volume from outside your vehicle. If they are out there, they will likely reply... Which can allow you to locate where they are just by turning your head this way and that to determine from which direction they are responding from. Lastly...they are loud and sound closer than they usually are... And a few mutts can sound like a huge pack. It's definitely not like the movies!! They make some weird noises, but definitely helps to distinguish them from neighbors pets! I mean, let control is a good thing, but I'm pretty sure that blasting the local chihuahuas won't do anything for your popularity or endear hunters to those that are still one the fence!!
Just go out a lot. You'll find some tips of your own and learn a lot of what works... And what doesn't. Hunting mutts is more fun than deer or elk in my opinion, so just go out and keep at it!! Don't let a string of bad stands discourage you. If you stick with it... You'll be posting mutts tagged!! ...To which I'll reply.... Sweet! Well done man!!