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use a pencil
Drawing is a form of visual art that makes use of any number of drawing instruments to simplified, leading to the development of the written language as we know it today.
HB PencilsArtists and draftsmen can use a variety of pencil leads in different hardnesses (e.g. H1, H2) and colors.H=hard and B=black pencils are graded on how hard (therefore lighter line) or soft (therefore blacker line) they are an HB pencil is mid range between the 8H and the 8B.
Use the ruler to measure the size of the circle you want - this will be a line all the way across the whole circle. Then, measure a piece of string with the ruler -- make this half the size of the original line. Use a thumbtack to tack the string in the spot you want the middle of your circle. Use a bit of tape to tape the other end onto your pencil (don't wrap it around or you will end up with a smaller circle!) Gently move the pencil around the thumbtack to make your circle.
Use a ruler to measure the line (horizontal?) and mark the middle of the line, then use a right-angle triangle to draw a vertical line 90 degrees from the mark. Or you can use a compass fitted with a pencil to draw arcs that will give the middle mark and a mark to line a ruler against to draw the perpendicular line required. Search Google for using a compass.