I get it! Spices can be expensive and take up a lot of space in a small kitchen! Start slowly and build up from there. For recipes like this, I think a good quality curry powder will get you on your way. As you become more familiar with spices you can add to your collection and try new flavour profiles. For this recipe - to keep things simple use 2 teaspoons of curry powder, a pinch of chilli flakes or cayenne if you want some heat, and fresh garlic or ginger.