To check your float height you can use a piece of clear flexible pipe. push the pipe onto the carb drain spigot on the bottom of the bowl and lift the other end up above the carb so it forms a U shape, then open the drain screw a little so fuel goes into the clear pipe. Now the level of fuel in the pipe should be about 2mm below the level of the bowl/carb gasket surface.
Higher will cause an overflow, lower may starve you of fuel.
Try to keep the bike upright for this.
I hope that's clear, I'm not the best teacher I'm afraid.