Fingers crossed!
That teapot stuff is confusing. I just bought a recipe for a chair with the little currency I had. Then, I go to learn it, the game just says that I already know this and removes it from my inventory... Why did it let me purchase it then?
So, first you spend a currency that's on a slow recharge timer to buy a recipe. Then you also need to grind resources to build the thing on that recipe. I don't think I'll be interacting much with this unless I run out of other stuff to do. It seems like a lot of work.
Haven't spend much time with it, so take this with a grain of salt, but:
You want to craft items from Blueprints to gain Trust EXP to increase the Trust Rank. Higher Trust Rank increases the selection in the Housing Shop, increases your maximum currency capicity as well as gives you more crafting queues (which you want, because it takes like 14+ hours for a single thing without speed-up, lol), and other stuff.
You only get Trust exp the first time you craft an item (there is a little symbol in the upper right corner of blueprints if you still get some, and it will tell you how much EXP you get when selecting a Blueprint too. Higher rarity blueprints give more trust-exp, but also a bit longer to craft.)
Placing furnishings gives you "Adeptal Energy", which increases your Realm Currency income at certain checkpoints. You get Realm Currency per hour, but it basically goes into a piggy bank first that can only hold a certain amount and you'll have to manually collect it and move it into your unlimited balance.
The Realm Currency can be used in the shop to buy Blueprints, finished furnshings and other useful items, like the instant craft potions, EXP books, artifact exp, etc.
(The carpenter in Qinqce village now also sells some blueprints).
The game gives you some instant-crafting potions at the start, so I think the most effective way to get started with is to immediately use them all and craft all the blueprints you have to increase your trust-rank for more queues and just place everything you have to reach the currency thresholds.
You can also visit a friends teapot and interact with the bird to speed up their crafting. Works once a day per friend. (But that's apparently currently bugged, lol).
You can set your teapot to automatically let people in instead of having to actively accept them, so you don't need to be online for friends to help out.
The placement-mode also has a tab for sets made out of multiple furnishings that can be completed for more Adeptal Energy.
The shop has 5 insta craft potions per day, I would priorize those with the Realm Currency and new blueprints afterwards.
They're super cheap.