This is a simple mission where you respawn when you die. I use this to flight training. After crashing with plane or heli, will respawn again.
To use the script, copy init.sqf to your own mission, then on the editor add a marker called 'respawn_pos' then you edit the player unit and add this initialization code:
this addEventHandler [ "Killed", {call on_player_die;}];
When the unit is in a vehicle and die, it will respawn with a new vehicle near the crash area.
If the player died on foot, it will respawn on the respawn_pos marker position.