14 y/o trying to get into self improvement, any advice/tips?

So I started knowing more about self improvement when I was 12, I wanted to do it at that age but I was waiting for the 'perfect time', 2 years has passed and I regret not starting earlier lol, but now I'm starting this journey.

Any advice on how to overcome bad habits? Such as: fapping, procrastination, ETC?

Any advice will do, thanks!