Signs of animals wise, or for a nice comfy sitting place? For sitting down to watch out for animals, pick something that will be good cover from view. Maybe a hedge that you can sit up against, or even a holly bush that you could discreetly trim to make a little sitting point underneath. You want to be able to blend into the background, so that you aren't seen by the passing wildlife, clear the floor so there aren't any twigs snapping as you get into position or move around. You need to have a clear view, obviously, and also pick an area where you know which way the wind normally blows. You want it in your face so that your scent goes behind you, away from the animals you wish to observe.
You can make a simple enough chair from a sectioned tree, if you see any trees being chopped down, ask the bloke to cut a stump about a foot or so high. Roll it to your site and set it in position, there is your chair! the good thing is it can double as a chopping block aswell to split small kindling on for your hobo stove. The good thing about holly bushes is that there is always an abundance of dead dry twigs underneath, or tinkers sticks as they used to be called. Gather them into a pile ready for your use.
As for siting the actual lookout point, you'll have to learn where your deer goes, when they are at certain places and if they have a routine. Use a diary, that would be best. See if you can distinguish between the different deer, there must be a way of identifying individuals, then you can tell which ones are turning up and when. Try a bit of tracking, not so difficult to do a bit of basic tracking by checking prominent foot prints and scat. This will give you an idea of how many are in the area, how long ago they were there, etc. Maybe after a while, you could take it to the next level and learn how to id which is male and which is female. This can be done by the tracks alone. After a while, you will see more tracks and learn to join them up, you may then be able to follow up on them!
When you are in your site, have a routine. Alawys put your binos in one spot, your brew in another, your book for IDing animals or tracks or whatever in another spot. Then, you don't have to trake your eyes off of the ground in front to be able to grab what you need. Take plenty of warm gear and a torch aswell, the winter is closing in fast!