Hand-drawing requires some skills, which will not be effective in a short time, and there are no solutions to some technical problems. You'd better find a teacher to learn. I don't know if you learn hand-drawing to talk about the bill or to draw the renderings. Generally speaking, you can draw with a pen. This kind of situation can be studied by some adult training institutions, but if you want to draw renderings, most of them are drawn with computer software and drawing boards, and pure pen hand drawing is rare. There are many training institutions that give online lectures and learn some basic introductory tutorials. You can go to dodowed, elephant club/little orange cat wedding.