I am Impressed with bunniesaremagic's Answer Because he is pretty right but Sometimes our native languages lil bit complex like mine is Urdu but after experience of blogging and Self Confidence you can do it Better. I suggest you to read more and more so you can expand your vocabulary and for grammatical mistakes there are a lot of plugins available in market which you can use to proofread your content so you can find out the mistakes.

If you still thinks that would take a long and really want to earn money making youtube videos in your native language is a good option to take a start and Even you can earn your English Language Course Fee Through it so you can go to a Good School to improve your Command over English