Going Medieval -

: Immediately pause and scout for a central location with mixed terrain.

: Create designated storage zones for resources. Place raw food and packaged meals on a wooden floor immediately to stop decay from the ground.

: Items still decay from rain. Research Architecture first to unlock beams, then build a roof over your stockpiles and workstations.

The goal of Day 1 is to prevent your supplies from rotting and keep your settlers from sleeping in the mud.