Hot tips, because the game doesn't make it terribly clear:
- The trails are actual previous players. Follow in their footsteps.
- There's a day and night cycle. You'll have about 3 days to do everything.
- Approach/attack zombies when they're not moving
- Guys in the black cloaks are pointing at something
- Dig 2/3 times to unearth something
- When you can, hold Space/Z to plant something
- You'll only get one shot at it