An amount of 70% power output is from arm pulling while kicking is not that important in moving forward.
The purpose of kicking would be making sure of a stream-line body position in order to reduce water resistance.
Free style can be challenging in the breathing while the pulling and kicking seems easy.
An important part in free style is Body Roll - Shoulder level should keep rotating when swim.
Thus, turn head sideways in timing with the shoulder turning up. Breath in, turn back in the water to form stream line body and bubbling, then continue to breath in again.