Question

describe the steps to be followed to draw a distance time graph

Answer 1

You should have readings of distance and time.
Draw x-axis and mark there the time.draw y-axis mark there the distance.
mention the scale you take corresponding to x and y axises.
mark the points that corresponds to your readings.
Join these points and you will get the graph

Answer 2

If you get distance time graph then you can calculate velocity by finding slope of that graph