If your soil is well prepared, it is still not to late to lay turf or sow lawn seed. For really green grass feed lawn with high - nitrogen fertilizer from April to Sept. Make sure you use a spreader to ensure fertilizer is spread evenly. Dethatch, edge and weed as needed.
Try mixing in some sweet vernal grass for a nice fragrance in your lawn. Make sure that you rake the needles regularly if you have pine trees on or near your lawn. Pine needles will kill anything underneath them.
If you wish to use weed killers you should do so now while the grass is growing rapidly. If your soil is too wet do not use a weed killer, to dry or if you have a young lawn. Do not mow your lawn for at least a week after an application. Never add your cuttings to the compost after a treatment.
Make sure you use a mower with a sharp blade when mowing your lawn. If the blade is dull it will tear the young seedlings from the soil. For the appearance of a larger area ddd gentle curves to your lawn.
Gentle curves are also easier to mow than sharp curves or corners.