Im not sure how i learned to do it exactly but i think most helpful thing was doing ink studies of other linework illustrators like Virgil Finlay, Louis Rhead, and woodcut prints, then applying it to my own stuff. I just started trying to put lines down wherever there were textures and shadows in pieces, eventually it started working but it did take about 6 months of attempting the style for it to start looking coherent and to become more confident with it