Grass Planting:

Prepare the area: add compost,  bone-meal or superphosphate and dig into existing soil, turn soil well and level area, water well to ensure soil is moist before planting.  Keep grass moist for the first two weeks, and then water as needed, check soil before watering to ensure grass needs water, a deep watering is better to ensure deeper root growth, rather than shallow watering that will cause the grass to have shallower root penetration. Avoid heavy traffic during the establishment period, remember that roll on lawn is not established until deep watering takes place.

When you do the first mow, cut as high as possible, once the roots  is established, you may want to correct any level issues using a fine coverage of lawn dressing, if the depression you are trying to rectify is deeper than 2 cm, rather lift and fill in lawn dressing underneath.
Do not smother lawn with lawn dressing , the blades of grass should stick out above the lawn dressing after application.
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In drought times mow as high as possible and keep lawn feeding to a minimum as this will encourage lawn to grow too fast which may stress root systems.