I started to make the halloumi cake recipe, and noticed that in the ingredients the flour is missing..How many cups of flour should i use

Answering from the same name (at the risk of sounding like talking to oneself), have a look at this recipe for analogy and measruements.
If you're not familiar with self-raising flour, it's simply flour to which baking powder has been added (2 tsp per cup flour).
Another Nancy
https://www.kopiaste.org/2008/02/cypriot-tyropita-cheese-cake/