Remove any lawn, rocks, sand etc. to a suggested depth of 60mm. or 80-100mm if vehicles are going to be parked on fake lawn.
Once the area is dug out, use a rake and sand spreader to get approximate level and installing any necessary boarders to prepare for next steps.
Once the area is flat and approximately level, fill with road base or other filling material. Level the ground with rake or level. Then, water and compact using a plate compactor to ensure the base is hard enough for cars or people to go on
Roll on the turf and make sure its fully attached with its base
Sanding and brushing with power broom