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M_V
I'm also in the process of trying to get to grips with cotter pin cranks.
This Sheldon Brown page is superb for an overview of removal and installation - https://www.sheldonbrown.com/cotters.html
The size of the pin depends on the size of the hole on the crank arms, From reading up British cranks are generally 9.5mm and French can be either 9 or 8.5mm - I think.
It appears that the pins have to be filed before installation of crank arms to ensure that they are a good fit.
Do you already have Bottom Bracket cup's?