To draw a line PQ and a line MN parallel to PQ, we will need a paper, a ruler, and a pencil. Follow the steps below to create the diagram:

1. Draw line PQ:
- Take a ruler and draw a straight line on the paper. Label the endpoints of this line as P and Q.
- Line PQ can be of any length and orientation on the paper.

2. Choose a point R not on line PQ:
- Select a point R anywhere on the paper that is not on line PQ.
- This point can be placed above, below, or to the side of line PQ.

3. Draw line PR:
- Using a ruler, draw a straight line from point P to point R. This line is called PR.

4. Draw line QR:
- Using a ruler, draw a straight line from point Q to point R. This line is called QR.

5. Find the midpoint of line PQ:
- Measure the length of line PQ using a ruler.
- Mark the midpoint of line PQ by dividing its length in half.
- Label the midpoint of line PQ as M.

6. Draw line MN parallel to line PQ:
- Place the ruler on point M and align it with point Q.
- While keeping the ruler in this position, slide it away from line PQ until it intersects line PR.
- Without moving the ruler, draw a straight line from point P to the intersection point of the ruler and line QR.
- This line is called MN, and it is parallel to line PQ.

7. Label the points:
- Label the point of intersection between line PQ and line PR as A.
- Label the point of intersection between line PQ and line QR as B.

Now you have successfully drawn line PQ and a line MN parallel to PQ using point R. Remember that parallel lines never intersect, and they are always equidistant from each other.