It usually happens during the summer of the election year, sometime before the party's national convention.
The House selects the president out of the top 3 candidate with votes.
This is done by the nominees and a committee of advisers. The factors that are important is the personal and political history of a canadate, and the state he/she is from.
A candidate that is running for President receives their nomination at their party's convention. This is a meeting that is held to announce the results of an election.
The citizens/ the people
Congress.
The President selects his own running mate.
4 years
he or she selects an exploratory committee
he or she selects an exploratory committee
he or she selects an exploratory committee
the legislative branch selects the head of government
4 years