The wormhole is simply a portal from point-a to point-b. There's no 'steering' any more than there would be if you walked through a doorway. On the other side are a plethora of stars, and their attendant planets, that are [*evidently*][1] within reach of the ranger ships.

> Earth’s sun was nowhere near the center of its galaxy, but was in a
> hinterland nearer the edge of it, where the stars were thin and
> distant from one another—a lonely house on a great plain.
> 
> Certainly not a condo in the city.
> 
> This place, this sky beyond the wormhole, this was more like New York.
> Or Chicago, at least. Stars blazed everywhere, some brightly enough to
> leave impressions on Cooper’s retinas. Gauzy nebulae draped between
> and among them, coloring whole quadrants of space with light refracted
> through gas and dust and the fresh brilliance of newly born stars.
> 
> <sub><Sup>[Interstellar: Official Novelisation][2]</sub></Sup>

Note also that the planet(s) that they initially travel to are the *closest to the wormhole*, which makes good sense since the wormhole is an artificial construct put in place to allow them to travel from Earth to another viable planet.

> Still, maybe it wouldn’t take all that long. In theory the trip through the wormhole would take a fraction of the time, relatively speaking. Maybe the closest planet would be the one to pan out. He might yet be home while Murph was still in her teens.


  [1]: https://tvtropes.org/pmwiki/pmwiki.php/Main/BellisariosMaxim
  [2]: https://www.goodreads.com/book/show/21488063-interstellar