Dig new beds + holes & plant in gnarly-as soil

Kia ora. My garden has been decimated by new fencing. I'm left with two big circles where there was a pile of scoria/clay/concrete - now taken away - but need the nasty top layer taken off to replace with some of the garden mix so that hopefully the grass can spread. The last photo shows another patch that needs to be dug up - mostly to then plant things in: Things to plant are: a wheelbarrow full of canna lillies to plant, x2 big-ish dracaenias, x6 small-ish pohutakawas, and a tangled pile of succulents (aeoniums) to untangle and plant + some other odd things that have been dug up and are now wilting away. All will require digging new beds + holes into the solid clay/scoria-ish garden. I hope that all makes sense! I think I have most of the equipment you'd need - including a battery-powered augur, pick, decent space + 10 bags of garden mix to disperse. Also hoping you can take away all the crap that's dug up? Would like it done before the rain hopefully comes in a week-ish. Thanks, Katie