Hes naturally born with them because hes a sayian.
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You pretty much only be as strong as Goku is to be a saiyan train with king Kai and when your not training with king Kai train hardcore like Goku does
Yes it is shown in the fusion saga they show a flashback where krillin has to lower his powers to match goku's
goku dose not have powers he uses energy witch comes from him but everyone and thing got energy he just learned how to control it
normal goku.
Depend on which version of Goku you're speaking of: Goku SSJ1 vs Majin Vegeta: Majin Vegeta Goku SSJ2 vs Majin Vegeta: Equal Goku SSJ3 vs Majin Vegeta: Goku Goku SSJ4 vs Majin Vegeta: Goku