You can honk and then fly to each body that seems interesting to get a scan.
I'm really new, but my understanding is that is how it used to be done before there was a FSS. Am I wrong?
Right for systems already explored by other people (you get the sysmap plus a list of “Unexplored” targettable bodies)
Wrong for systems never explored by anyone. Ie you are the first person to visit the system - then you get nothing until you have used the FSS to zoom in on the bodies.