you save before you start the mission and if you die then you load the save game, just dont do anything major or impressive after you save so yu can retry the mission quickly
Well there is a strangers task called "remember my family" and the mission is to kill Edgar ross in a duel
That depends on what you mean. If you mean as far as the plot of the game goes, it ends when you complete the Stranger side-mission "Remember My Family". Or, you complete the game after you complete all missions, challenges, etc.
Complete the mission previous to that mission.
by a train from the army its a mission
You can only do this on the burning of the stables mission
An Appointed Time
There should be a stranger sing appearing in blackwater with the mission. "remember my familly" After that you visit the "killers" wife,brother(?) and eventually ross himsellf
you fail the stranger mission if you threated or kill them
There are several co-op missions.
Yes, there is a mission in which you do this.
Yes and you don't need red dead redemption to play
If you are meaning when you get shot by the Army, then yes, its part of the mission. Its the last mission also. You then play as Jack.