maxim concept is correct, even the area is small, proper drainage is still necessary, u never know wat is underneath the ground.

this is what i do for my 5x8 lawn

1. get the indon worker to dig it 6-8 inch below ground level
2. undersoil piping which drains the water to longkang (drilled with 20 cents coin size hole)
3. a layer of stone, small sized
4. a layer of PVC mesh
5. a layer of soft sand
6. a layer of planting soil
7. pearl grass!

all done with proper leveling
do not worry about lalang just treat it as some exercise on Sunday morning