Well you should first pull all the crap and grass out from the ground as you have done it, then crush the upper layer of soil into tiny pieces, then water it and let it be for a while, after then comes the sowing, sow the seeds and keep a scarecrow near the garden so that the birds will not eat that seeds, water regularly on the very morning and night, I think sprinkle or drip irrigation is better than the traditional methods of irrigation as it provides water in spray and directly moisturises the soil, you should also use fertilisers to increase the fertility of the soil.