Depends how autistic you want to be about it. If you just want to have something warm to drink just go to your local supermarket, buy a bunch of random teabags, boil water, throw tea bags in, leave it for a few minutes then drink when its cold enough. That's it. You can add lemon and sugar/honey, but at that point you're drinking lemonade. Teabags tea doesn't taste 'bad', but in my experience there are 2-3 tastes and all flavors fall in one of them, more or less.
If you want to taste something a bit more interesting you'll have to put a bit more money and effort into it. And I say interesting instead of "good" because a lot of people don't like "real" teas. I wouldn't say most of them taste good, like a taste you'll like instantly, but I love em because you get to drink stuff with tastes you won't feel elsewhere.
I get my teas from https://yunnansourcing.com/
(if you live in USA you can try https://yunnansourcing.us/
). I don't know if there are better options, but these guys have quality teas and they ship to most countries. For the first time I recommend you buy a bunch of samples packs to see what you like, the more diverse the better. Try a sample pack of black tea, one of green tea, one of oolong tea etc. My favorites are oolong teas, but that tends to vary a lot from person to person, so you should try as much stuff as possible. A lot of people sperg out about matcha tea, I think it's fine but in my opinion it's overhyped, overpriced and a pain in the ass to "brew" properly (google it if you're interested, different process than normal tea).
There are multiple ways of brewing it, again, depending on how autstic you want to be about it. The main ways to brew it are:
1. Western style: basically same as what you do with teabags, put in tea, put in water, leave for a few minutes, throw leaves, drink
2. Grandpa style: put in leaves, put in water, drink half, refill with water, repeat until the flavor is gone
3. Gong Fu: put in leaves, put in water, cover it, leave for a short period of time (10-60sec depending on the kind of tea), move water to a different recipient, drink it. Add more water to the leaves, increase the infuse time by 5-30 seconds (again, depending on type of tea), repeat until the flavor is lost. With some types of good tea you can repeat this up to 15 times. This is the most autistic one by far, as the taste of tea will depend a lot on the infuse time and tea/water ratio. I suggest looking up how to brew it for every type of tea, (there's more to it than I explained here too, like for some teas its recommended to 'wash' it, as in pour water on leaves then immediately throw it away before doing your first brew) starting from there and experimenting with it if you really want to get into it.
4. Cold tea: someone already explained it, basically throw in water and leaves, put it in the fridge, let it there for a few hours. Personally I think that's a waste of good tea and a grave sin, but some people like it, so you could give it a try I guess.
For any type of brewing you chose I recommend googling it beforehand for the type of tea you want to brew to make sure you're not messing it up. Most important thing you should know (unles youre doing cold brewing) is that green, white and yellow teas should be brewed to lower temperatures (I do 80-90c) while most other teas should be at boiling or just below boiling temp.
My favorite way to brew it is Gong Fu, mostly because it's somewhat of a small ceremony. It feels pretty cool using gaiwans and drinking from those small traditional cups (you can find them on the site I linked above). If you want to try that I recommend getting one or two small gaiwans (120ml or smaller, I use a 100ml one), a pitcher and some of those cups. If you plan on making tea for multiple people you can get a larger teapot too (or a larger gaiwan, but larger gaiwans are hard to handle and you're probably gonna burn yourself, spill tea etc). Also you can get a water thermometer and a 0.1g precise scale to measure exactly how much tea you're adding. I know, it sounded like a pain in the ass for me too at first, but now it feels like part of the ritual.
If you don't want to get into any of this autism, but still want to taste some "better" tea than what you get in teabags I recommend grandpa style brewing, the only thing you should look out for is to use water below boiling temp for green, white and yellow teas.