Take your ship out and collect crates so you can upgrade to larger and better ships. Watch out as other players are out there just waiting with their torpedoes!
Click to launch torpedoes which will go in the direction of the line outside your ship.
There are four ways to move your ship:
Left click and hold outside your ship's inner ring
Right click (and optionally hold) outside your ship's inner ring (this is the recommended way to move)
Tap and hold (on touch screen) outside your ship's inner ring
Use the WASD or arrow keys to move, and 'x' key to stop