Bandai Namco Entertainment The Witcher 3 Game of The Year Edition (Ps4)

whats the difference between this and the complete edition?

Do i need to play 1 and 2 before this game? Or is it ok to start on 3?

Friends, will i have the russian voices by purchasing this disk (game of the year edition) or not? i need russian voices only.

Is this digital or physical disc?