I only drink black tea and green tea. I avoid fruity infusions. As far as I'm concerned if there are no tea leaves in it, it's not tea.
I have black tea usually with milk although Earl Grey is nice without it. Steep as long as you want, until you get the strength you like.
Some black teas are really better without milk.
Don't steep green tea too long or it goes bitter.
Never add sugar (that's just me though). Use a tea pot whenever possible.
I need to put tea bags on my shopping list now.
Fat does not make you fat. It's actually pretty important.