Talking to some of my friends I've realised that for some people, ordering at a loose leaf tea store can be quite confusing and essentially overwhelming if you have never done it before. I know I was scared the first time I bought at Teaopia. So I decided I should write an entry with helpful instructions for all of my troubled viewers.
First off, before going to the store you should decide what you plan on buying, a cup of tea, and bag of tea to go, or some tea ware? Maybe you want to do all three. If you want a physical object like a mug or steeper they are usually just placed on shelves throughout the store and you purchase them as you would at a regular department store, paying at the cash.
You obviously can't go up the the employee behind the counter and ask for a "Regular tea" because simply, there is no such thing. Like I've mentioned in a previous post, stores like Teavana or David's Tea offer tea in a variety of different categories; green, white, black, oolong, herbal, mate, and pu'reh are all possible sections (they are usually colour coded). If you don't know what type of tea suits you best, check out my Core Four post which should shed some light on things.
Hope this 'tutorial' helps you, and let me know in the comments if you have any further questions!