You can only learn the style by imitation and by practicing, practicing, practicing. However, you can always ask in the forum how or where you could improve your paintings.
As far as brushes are concerned, I can give you the following sets as tips, but you will have to find out for yourself which brushes suit you best:
INK brushes for INKTOBER 2023. Feedback.and final release
Jarry H. Line Brush Set for KRITA - DOWNLOADLINK
Michelist