You spawn in a room where you can choose your weapons.
There are 3 teleporters:

The left one sends you to the PUSHLINE zone.
The center one takes you to the main area.
The right one goes straight to DMR shooting.

When you spawn in front of the house, bots only react to headshots. Disable this by shooting the red circle under the house. If headshot-only is needed again, shoot the green circle.