Welcome to GOY, Why not look at the 'small garden ideas' and 'courtyard gardens' on here that members have done already you may get some great ideas for yours?

Euonymus fortunei 'Silver Queen' immediately came into my head. That can be trained against a wall, is evergreen, can be pruned to shape and is lovely.

A clumping Bamboo such as Fargesia would give you evergreen and a screen and the soil sounds good for it.

Evergreen and the early morning sun could be a problem regarding leaf scortching but I would try the pineapple broom, cytisus battandieri, grey-green leaves and yellow pineapple-scented flowers. Can be grown as a free-standing shrub or trained as a fan against a fence. The soil can be improved with the addition of sharp sand or crushed grit.

Some Boxwood at the base and Honeysuckle to climb perhaps?

Thanks. Will look into all the options and let u know.

Take a look at Mossy....garden, a courtyard and a very beautiful one.