New Build Garden

Hi all,
First time gardener, I need some advice on how and where to start solving my garden issue.
We have moved into a new build last year and the garden was left blank with the soil rotavated. We couldn't get the garden done and have left it in a bad state, fast forward a year now. It's full of couch grass,thistles and all sorts of weeds. The soil is also clay base, as with all new builds.

After looking online & alot of Youtube, my plan is to:
- Fork and dig out all the weeds, stones, branches and junk
- Mix in some sharp sand into the soil to help with drainage
- Add some top soil
- Rake, level and flatten
- Turf it with grass
It's a big job, I can buy/hire out a rotavator which will help break up soil. However there are alot of people against this as it will just spread out the weeds even more.
Can anyone suggest anything different? I've also heard to just remove 15cm of the top soil and just put top soil & sand and flatten.
Thanks,
0
Posts
Maybe I've got the wrong end of the stick. Is your plan simply to replace that grass, with new grass? or will there be any planting going on?