Help needed creating a spell

Yes. See Octavia's one thousand legions for a spell almost identical to what you describe, just with an extra magnitude for size in case you want to confront armies. Note that such a spell may have to be a Ritual (due to its "massive" effect), depending on the troupe's judgement; a sufficiently "small scale" version would not be, however.

Well, there's a caveat there. Because Range is Touch, you can only provide new directions to the little critters when touching them, including upon creation. So you can create them and assign them a task, but you can't control them with magic from afar. Though you can certainly assign them a task that includes returning to you for new instructions at the end, and perhaps a task to follow simple visual instructions if you remain within sight of them (e.g. move left or right, forward or backward, depending on whether you are raising your left or right arm, both or none).