I don't like fruit teas or herb teas - so I'm not too sure of the 'correct' way to prepare them..... 8)
Here's the traditional British way to make tea - which should be with leaf tea, not teabags. I use Twining's Teas and have Earl Grey, Lady Grey, Lapsang Souchong, Ceylon and Assam as a stronger, breakfast tea.
First boil your kettle. Put a little of the boiled water into the china or earthenware teapot (metal seems to give it an odd taste, IMO). Swirl the boiling water around to warm the pot and then empty. You should then add one teaspoon for each person plus 'one for the pot'. Pour on the boiling water. Give it a quick stir and allow tea to brew for 3-4 minutes. Put milk in cup (there is a lot of hooey talked about whether milk should be added first or after the tea is poured - I've never been able to detect the difference!), pour on tea. Drink!