youre not gonna play comfortably unless you get some sort of controller
get an USB n64 controller, they exist
an USB
get xbla version
first own a copy of the game
Here's the keybinds I usually use for n64 games (translated from 360 to dualshock)left stick = center stickd-pad = d-padright stick = c buttonsRB/LB = R/LX = ACircle = Bright trigger = Z