First, you have to buy the right tea. It's a mix of several kinds of tea together. I saw the ready mix HK style tea before in Chinese supermarket. In Toronto, you can find the wholesale as well.
Second, I have tried many evoperated milk and the best one is called "Dutch Lady". They are in Toronto T&T sometimes but are not always in stock. Be patient to find it. Milk is very important and put more.
Third. Water has to be boiling hot. Put tea when boiling. You don't have to use 白布袋. Just transfer water with tea between two pots several times. Finally pour into a pot with filter. Then pour into your cup with mike already when the water is still very hot. Enjoy.