Oh, and texturing the landscape mesh.
Also, my landscape is currently infinite, which isn't ideal - really, it should be a finite space, and if you go off one side, you reappear at the opposite side.
And I suspect I should've used a terrain instead of a plane, to make texturing, and detail scattering easier.
But, I figure I can go back and change these things once it all feels a little more cohesive (and once I've got a bit more of a clue as to what I'm doing).