Sorry you feel it was abrupt. It was not meant to be.

You had already suggested that the ground be cleared before the seeds were sown. The answer is yes, you need to remove all the grass, cultivate the ground but without in any way manuring or feeding it, and then broadcast sowing your seeds, preferably mixing them into a mixture of fine soil and sand. Water lghtly after broadcasting and watch for seedlings coming through. Do not do anything until the first leaves are through or you may weed out the very plants that you want.