Starting and stopping are the key:
Starting – captain climbs on the bike and stands with feet splayed wide.
Stoker gets on and sits in the saddle.
Stoker sets up the pedals at the “ten past” position.
Captain puts starting foot on top pedal, counts 3-2-1 push! and away you go.
Stopping:
Stop pedalling.
As the captain brings bike to a halt, he stands on the pedals with the RH pedal at the 6 o clock position. When the bike stops, he steps off with the left foot to keep the bike upright.
The stoker does nothing except pedal or sit there like a piece of luggage as required. Do not steer. Do not try to brake. Do not waste time seeking a sound proof shelter.
Communication is good, especially about gear changes. The stoker needs to know, especially when moving up to the big ring. Ease off the power. This avoids broken chain misery.
Tandems are great when moving along but top-heavy when stationary.