So how do you scout?
Word of mouth is hard to beat, if someone tells you they hear them howling here or there, I go there.
If i'm starting from scratch I'll start topographically via google earth and go from there. If it looks like an area that would hold predators (and is legally huntable) i'll mark it down and then go check it out in person when i'm in the area. I usually just walk field edges, swamp edges or softwoods meeting hardwoods looking for scat/tracks and you can make pretty short work of an area and have a good idea if they're there or not.
do you use calls?
I personally don't, others might.
scout at day or night?
Generally daytime. If i'm just howling an area checking for activity i'll do that at night.
what do you look for?
Scat, tracks, kill sites, small game and food sources. Easy travel corridors.
Do you plan areas and entries into the area?
It's nice to have a few parking areas to get into a spot that way you have some options based on how the wind is. Thats in a perfect world...especially once the snow starts flying and all your great parking spots are snow banks. Some of my better spots only have one way in so I won't even bother going unless the wind is right.
I'm still green but some of these tactics have worked for me. Good luck!