The Final Solution was final and didn't have 'stages'. However, one can list the various stages leading it.
It worked something like this:
Please also see the related question.
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conceptualisation - someone had to come up with the methods.
preparation - the structures and logistics had to be put into place.
methodology - the people/departments involved had to understand their roles/duties.
implementation - the plans had to be actualised.
adaptation - the methods and implementation needed to be honed as the process moved from theory to reality.
boycott, Nuremberg laws, kristallnacht, ghettos, camps, deportations, the final solution, liberation Please see the related question. There are many different ways of dividing the Holocaust into stages ...
the ghettos came before the final solution
The Final Solution (of the Jewish question).
The "Final Solution"
The Final Solution was not implemented in 1941. By the time of the Final Solution most of the ghettos had been cleared and the inhabitants murdered.