Should I use weed killer before turfing ?
I am going to turf the sloped area in the below picture but notice there are a lot of weeds so presume it’s best to get rid of these first to save them growing through the new turf. Is it ok to use weed killer or would this have an effect on the turf once laid , ie would it contaminate the soil.

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I think you may struggle to grow grass on that slope, due to shade from tree and shed and the very dry soil you will have from the tree roots.
Chill will wake you, high and dry
You'll wonder why.
But do keep anything you plant well watered until they are established
Spacing depends on the eventual size of each plant, so it's a case of doing a little research. The general conditions you have will dictate though - some will grow slightly less, and some may grow slightly more.
Another common, but excellent ground cover plant is Cotoneaster. On a slope, it knits the ground together too, although that isn't particularly steep.