Well that blackness has left you with a blank slate in which to create, now all you have to do is find a way to materialize a landscape.

Simply imagining a place you know from memory may be a good way to start. Imagine your front yard, what the street in front of you looks like. The picture is hazy at first but then it gets clearer and clearer, until you reach out with your hands and touch the grass. And then there you are, standing in your front yard and you can go from there.

If you just float there in the blackness with no intention, you will probably gravitate back to your waking body. Create a different focus for yourself - focus on a new dreamscape.