you should do some contour drawing! pic out your favorite cartoon character and draw them or get a bunch of random objects and draw them. idk if you like to draw comics but try to make your own comic. try to draw a moving object. draw a really specific moment in time that you remember.
Well, if you want, you need the right software to begin with. Then, you want to read a manual on it, or just use YouTube to figure it out, but the software is most important. Then, just use trial and error.