Outline a plot of land on a map

You need to know the coordinates of at least one point in lat/lon degrees. If you don't have any surveying points, you might take coordinates from a GPS unit if the point is visible.

Using QGIS, you could create the other points of the polygon with the Azimuth and Distance Plugin. Take care to convert the degree-minute bearings into decimal degrees.

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With the additional Information, it is easy to locate the points next to the Abuja-Kaduna Highway. I have taken the Nigerian Minna Datum with UTM 32N EPSG:26332. The accuracy of the Minna datum is reported to be about 3 to 6 meters.

For use in Google Earth, you can convert the corner points into KML format in a last step:

<?xml version="1.0" encoding="utf-8" ?>
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document id="root_doc">
<Folder><name>corners</name>
  <Placemark>
    <name>A.4589</name>
      <MultiGeometry><Point><coordinates>7.213681182925083,9.242681685792601</coordinates></Point></MultiGeometry>
  </Placemark>
  <Placemark>
    <name>A.4590</name>
      <MultiGeometry><Point><coordinates>7.21464061889053,9.244143155822583</coordinates></Point></MultiGeometry>
  </Placemark>
  <Placemark>
    <name>A.4591</name>
      <MultiGeometry><Point><coordinates>7.215811177177327,9.243701475697776</coordinates></Point></MultiGeometry>
  </Placemark>
  <Placemark>
    <name>A.4592</name>
      <MultiGeometry><Point><coordinates>7.215774243544854,9.242327697539729</coordinates></Point></MultiGeometry>
  </Placemark>
  <Placemark>
    <name>A.4593</name>
      <MultiGeometry><Point><coordinates>7.214939943530562,9.242397736493757</coordinates></Point></MultiGeometry>
  </Placemark>
</Folder>
</Document></kml>