How do I improve dry, dusty soil?

I’m a newbie gardener and have just taken up some turf to make a new flowerbed. The soil under the grass is quite dusty and dry, how should I improve this to make it suitable for planting shrubs and flower seeds?
I have also removed a strip of thick gravel put in place by the previous owner around the border of the garden. The soil underneath is hard and compacted. I’ve managed to break through the hard top layer and there is some very dry soil underneath and then further down clumps of orangey (what I assume is) clay. How should this be improved?
I have also removed a strip of thick gravel put in place by the previous owner around the border of the garden. The soil underneath is hard and compacted. I’ve managed to break through the hard top layer and there is some very dry soil underneath and then further down clumps of orangey (what I assume is) clay. How should this be improved?
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You can improve the texture of the soil by adding compost to it, then also mulching with compost or bark when you're planting which will help keep the moisture in - then as it breaks down that will further improve the soil structure.
I would also advise buying a soil testing kit from a garden centre to determine the ph of the soil before deciding on which shrubs to plant.
'You must have some bread with it me duck!'
Potting "compost" is a growing medium in which we grow plants directly.
In the meantime, buy the cheapest MPC you can find to spread over clay which has been first weeded and then pierced deeply with a garden fork to allow water to penetrate more easily and improve drainage. You can then top this with better garden soil, well-rotted horse manure and/or better quality John Innes nos 3 type compost. It needs to be ericaceous and lime free if you plan on growing plants such as azaleas, pieris, rhododendrons.
Adding a mulch of well-rotted manure and/or garden or MPC compost every autumn will improve the soil's texture and health immeasurably and you won't even need to dig.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw