Start with your niche and create a style that only you can consistently provide , provide good content and study your fandom and followers and listen to their opinions and suggestions and adjust accordingly all while not losing identity.
Make sure you don't copy other's content, to be generous and give credit to others that you use their content such as music and so , work on improving your styling , quality and story telling , listen to feedback and improve.
That's pretty much it as a beginner, it gets really advanced once you pass the first milestone of 100 active subscribers , until then, keep up hustling as so