Find a topic of interest that you can keep on covering, also take note of your main target audience so you can do up a vid suitable for them
Plan your storyboard for each vid
Think of what kind of youtube persona you want to portray out in your channel... celeb? Funny? Serious topics? Informative? Pick 1 or 2 to start of with
Learn to do some video editing as well, it'll help to have subtitles in your vids
It'll be a long journey before you can really start earning money, for eg, you need at least 1k sub and 4k hours of watch time(of your videos by others) then you can start to monetize
Lastly, you got to have passion in doing it, and keep on having that passion. You may need someone or something to keep that passion burning as some people passion died off very fast
All the best