1-Entering with the left leg and exiting with the right one.

2-Entrance du'aa: "i take refuge with allah from all the jinn (males and females)" (agreed upon)

3-Exit du'aa: "o allah bless us with forgiveness" narrated by all sunnies except al nasa'y

People go to the bathroom several times per day, so imagine the reward you gain out of applying those three steps when using the bathroom!