I've recently moved house and have a 30m2 patch of ground that I want to sow a lawn on. The top 10m2 or so used to have a patio laid on top of it so it is really sandy, maybe 3 inches or so of sand before you reach any type of soil.

The rest of the ground is generally slightly sandy and quite compact.

What should I do to prepare this ground for sowing grass seed on?

This is what I was thinking, please correct me if I am doing anything stupid or if I'm on totally the wrong track(first time attempting this):
Remove most of the sand from the area where the patio used to be.
Use a shovel all over and turn the soil over.
Rake it level.
Remove as much stone and rubble as possible.
Get a jumbo bag of topsoil and spread it all over(should this be worked in?)
Rake, level, seed?

Any help would be great, thanks