Launch, out - Go out with your vessels.
Into the deep - Into the sea; at a distance from the shore.
For a draught - A draught of fish; or let down your nets for the “taking” of fish.
Related Commentaries of Luke 5:4
Luke 5:4
4 Now when he had left speaking, he said unto Simon,Launch out into the deep, and let down your nets for a draught.