Cooling Systems for beginner (electronic car)

[Evia]

Hey all

I'm Evia, from BGR Racing team, Israel.
This year we have decided to take the challenge of building an Electric car for the first time.

My sub-team is heat removing, which is responsible over the car's entire cooling system - engine, accumulator container, electric boards.. etc etc..

So right now i'm trying to get a clue as to where to start..

I suppose my first question is how much total heat, approximately, is needed to remove?
second question is what kind of cooling system is recommended? air, water or oil based?

third - any reference or guideness will be highly appreciated :)

Thanks a lot! :)