Just remember Finnie, crawling around prone can be very effective when it comes to sneaking past zombies. You'd be surprised how close you can get, not that you should. You can also use Q and E to roll in either direction, when prone. Running crouched is good too when you're traveling near-ish towns, as running upright is sure to aggro tons. Don't underestimate walking either. Just watch the eye and ear icons, they show how much noise you're putting out, and how easy it is to see you. Stay on grasses too, as they make you harder to see than on pavement.
When running from a zombie, try to make sharp turns and move through trees and around buildings. Zombies often get confused and stop to look around. You can always try doing this and then diving to the ground, then laying there prone in the grass. You should have 0 bars in sight and sound.
EDIT:
This is also pretty good for getting an idea of where to scavenge, it talks about some buildings in Elektro. Of course this route is always risky, and better if you have more people, but it's good to be able to identify some of the buildings like the fire station and hospital.