Quickest way to do it is to ID your points as Chainage and Level. Then draw a polyline using absolute coordinate entry.... X,Y
Enter your Chainage as the X value, and your level as the Y value.
That will give you a profile at 1 to 1 distortion (which is fine for cross sections).
Apart from that, you need to get a specific version of AutoCad, and learn how to use it. It's all a bit much for us to teach you here, but we do have a lot of tutorials here.