Just started Hookah Need Help

[KhanTheConqueror]

So 2 week back i started Hookah and it was going well i wasn't adding a lot of flavor due to inexperience the smoke was good but my bowl broke and bought a new one using the new bowl first two sessions were great i was getting the hang of it and then  tried Double apple and Sour Paan the taste of these two was amazing but my flavor burned which gave me a stinging feeling at the back of the throat. 

 I want to ask is how much flavor should i use and should i add a double foil layer 

i have a steel based Hookah its pretty common one here in Pakistan 

what is the best method to make a perfect Shisha can anyone please help