It's very simple.
For one cup tea :
tea bags : 2
If you use ginger, take it out of tea before drinking. You can also use teapowder in which case, you need to filter tea as you would do for coffee.
For better taste, tea should be boiled for long time. The more you boil, the more creamy it will be.
I find that tea powder is better than tea bags. The amount of sugar can be varied with your taste.