Just 'wing' it, a large pinch of salt and a smaller pinch of cumin, tumeric etc, plus a small squeeze of puree and couple of heaped tablespoons of garam masala should be ok, cooking is all about trial and error, halfway through the cooking cycle taste it, if its not strong enough add a little bit more, if its too strong put a bit more water in. After a couple of goes at the recipe you'll have cracked it, it'll be your unique recipe! Good luck.