Reddit mentions of Aiya Matcha Whisk Holder for Tea Ceremony (Green)

A.) Some brands are available via Prime, yes, like the DoMatcha tin you linked. Others, like Adagio's, are available on Amazon but don't qualify for Prime shipping. I'd advise getting a sample size starting out (Adagio offers one here) as it can be pricey, and matcha will go stale faster than most other types of tea. Keep it well sealed!

B.) Honey certainly can help sweeten it, though I would melt the honey first. It's a fast prep at a lower temp, which won't allow the honey to melt. Fast dissolving sugars or simple syrup might be easier.

C.) Brewing: You will need a few tools. Bamboo matcha whisk (the only brewing tool I would call essential), small bowl with enough room for whisking (avoid plastic, it can change the flavor), a sifter/strainer, hot NOT boiling water (170ºF-180ºF ideally), and a quick hand. I always recommend sifting the matcha, as the finer the powder is, the easier and faster it is to whisk it, and you avoid your matcha getting gritty and clumpy.

Steps - Preheat bowl and bamboo whisk with hot water. Empty and then sift 1/2 tsp of matcha powder into the bowl (you can use more or less to taste). Carefully pour 3-4oz of hot water into the bowl. Gently scrape any powder off the sides of the bowl with the whisk and break up any large clumps. Being whisking in a quick back and forth "M" or "W" shape, taking care not to scrape the sides or bottom of the bowl with the whisk. You are done when there is a nice even froth/foam on top, almost like the head on a beer.

Drink quickly! This is not a "sipping" tea, as the powder continues to steep as it sits, and will get more bitter the longer you wait. Think of it as the espresso shot of the tea world. Many people will dilute their matcha with hot or cold water/milk/etc at this point to mellow out the strong grassy/sweet flavor, but that is all up to you. I am a big fan of diluting with Vanilla Almond Milk and drinking it cold, but it goes great in lemonade and just by itself as well.

If you get a bamboo whisk, which I definitely recommend, make sure you let it air dry completely, or utilize a matcha whisk holder. The bamboo will mold if you stick it inside of a container while it is still moist.

Best of luck! I love matcha and drink it almost everyday, but if you aren't a "green tea person" the flavor can be surprising. Google "matcha health benefits" and you'll see all kinds of craziness about it. If Dr. Oz endorses it, it must be good, right???