Like many Americans, my first teas were lipton, red rose, tetley, etc. Once I realized there were really three readily available types, black, oolong and green, I started appreciating the different varieties. Then I found the varieties within each of those types and it was like finding craft beers as a beer drinker.
Now Yunnan teas are my favorite. I found them several years ago and they are my daily choice. Like others have said, it is a tea that is hard to make taste bitter. There are so many choices within the Yunnan type that it is hard to say which one is best. I think it becomes a personal preference.
My favorite is Grand Yunnan from T2Tea but it is $18US for 50 grams, which is pretty expensive for me. Kusmi Grand Yunnan is 18US for 250G's. But there are some local tea stores with nice Yunnan's too. One is a nice organic Yunnan that is about 12US for 100G's.
I think if you are new to tea you should try different varieties and brands (Not lipton, tetley, red rose, etc.)and see which one you like the most. I still like my Darjeelings, jasmines and my old standby, Prince of Wales. I think changing up the tea you drink makes you appreciate the subtleties more. I find I don't notice the subtle notes of a tea once I drink it every day for a while. I usually have two Yunnans, two Oolongs, two green teas (Jasmine and regular), a darjeeling and my old standby Twinings Prince of Wales and Irish and English Breakfast teas in the house. When I splurge once or twice a year and order the Grand Yunnan from T2Tea in Australia, I try to relish every cup like a page from a new book from a favorite author.
As a last note, I think tea is like certain veggies like broccoli, cauliflower and asparagus. If you make them right, they can be sweet, tasty morsels. Cook them wrong and you have bitter, sulphur tasting fiber or mush. I never pour hot water directly on my tea and I stick with loose tea so the tea is not ground to a powder for the bag. Try it in different strengths and find the way you like it.