That's a tough question. It depends on how much you can spend and what you are looking for.
I recommend samples, that way you can try many types of tea without too much money or commitment. You can try a single tea from each tea type and explore from there.
Yunnan Sourcing website does many samples. That's just my go to, but I know there are many other sites others would recommend. For more black tea blends, like your English breakfast, try Upton Tea Imports.
But if want even less of a commitment than that, try just spending more for your tea from the store than you usually do. Price does equal quality for most teas you'll buy. Trying whole leaf tea will get you higher quality teas as well.
Looks like a very popular tea from T2Tea. Thanks for sharing!