What are we supposed to do? We can't possibly construct it for you, and the instructions are pretty straightforward. I don't know how to improve on the step-by-step instructions you've provided.
Have you started? What have you done? Have you constructed a segment and found the midpoint?
I would suggest using a geometry textbook with a section on constructions - most geometry books have a chapter or at least a few sections. Any diagrams they have there will most likely be more helpful than a description found here.