Nice to hear you're really going to do this.
Well, drawing with a real pencil and paper is completly different as drawing with a grafictablett.
Well, just start as you want, just get a Notebook A4 with squares, start with gradients(From white to black), because this is a must need skill at drawing.
"Drawing images in front of me VS using my memory VS using my imagination."
First-, Second-, last step.
I'd prefer to learn as much as possible, so if you just want to draw Animes/Mangas, dont say it would be enough to learn gradients and anathomy of human - its much better learn just "everything", what is needfull being a good artist

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Im really sorry, i really would like to write more about drawing but my english is not that good as i wish.... .
Hope you understand much as possible (:.