So this is what my roster looks like right now
So next question is which of these characters should I start leveling up? Since it doesn't work like Star Rail where you need a full party, do you focus on one character at a time or do you level multiples? Is there any character from the ones I have that fulfill any important role like tank/healer? I'm sure it doesn't really matter at the start of the game where I am but as I get further in, can anyone suggest which ones I should focus on leveling? Are there any activities in the game world I should prioritize?
Also I have 20 special wishes and about 8000 primogems for now. Is there any character I should try for from the current lot or should I wait for a rerun of any particular character that might be soon? I know there's a big expansion due in a few weeks. Is it worth waiting till then to use wishes?
I'm sorry I know these are all completely newbie questions. I would appreciate any help and tips on what I should do.
So, most things are very much the same as they are in Star Rail, so progression in general should be pretty straightforward for you (weapon is light cone, artifacts are relics, talents are traces), just follow the story (the quest on top of your list), do side quests, explore the world as you see fit - that's the largest difference, if you need more account XP, you can just do... stuff and go open chests.
The beginner banner is different, you can only roll 20 times on it in Genshin, and you have Noelle (you always get her there), so you did them, there's no 5* character guaranteed on it unlike Star Rail.
Now the character progression focus is a bit less obvious, because as you say, you should focus more one DPS character first, but it's not like you should neglect your other three party members too much, because synergy is a lot more important than it is in Star Rail, you really want characters that have elemental synergies with one another - the likeliest one for you this early will be "burning" with applying Pyro (fire) and then Dendro (plant) - or the opposite way around, doesn't matter - to inflict a DoT on ennemies.
From you chars:
- The obvious choice is Tighnari as main, he's a strong Dendro DPS.
- You have constellation (eidolon) 1 Dehya as Pyro support to apply burning in an AoE and do a bit of damage with her burst while also being defensive support (she will absorb some of the damage received by your other chars).
- Bennett is a good healer that comes combined with the best ATK buff in the game (think Natasha+Tingyun all in one), he's outright broken (and with 2 Pyro characters in the team, you activate the Pyro "elemental resonance" which is a free +25%ATK for your team at all times - there are different resonances for different elemental combos).
- Last slot is more flexible, you could use Noelle to give a shield to Tighnari, since he uses a bow and charged attacks, he can be staggered easily by ennemies sometimes and a shield avoids that.
You could use Beidou, an Electro offensive support for more damage, plus Pyro+Electro explodes and staggers/send enemies flying which is also useful for Tighnari to stay safe.
Kaeya is also a decent offensive support but requires characters in melee range which is not ideal for Tighnari, and he is also Cryo (ice) and there's no synergy between him and Dendro chars like Tighnari.
Ideally you'd want to complete the team with a Hydro (water) character for the triple reaction of Hydro+Dendro=dendro cores+Pyro=Burgeon (it creates effectively floating mines that explode with fire), but that's just hypothetical and you'll do just fine with two characters for now, you have three that have obvious synergy both offensive, defensive and healing all together, so you can do what you want really, it's not like Genshin is very difficult early. Just focus on a main first like Tighnari, then some on your other party members, but it's not you'll get stuck.
Now for content, you can kinda do what you want, but even more than Star Rail the game pushes you to do events when available for primogems, they will not stick around unlike HSR.
But you're in a big hurry to complete everything anyway, take your time and enjoy the game, you'll unlock more things along the way like housing, fishing, and the card game, you can ask more questions when you reach that point.
As far as rolling goes... it's all about getting who you really like, but of course early on, easier said than done.
Right now there's Alhaitham, top-of-the-line Dendro DPS... but you already have Tighnari, so if you don't like him, his role is already filled.
The other banner is Kazuha, an amazing Anemo (wind) support, he is also exceedingly strong, but be warned that he will require materials that you cannot get for quite some time, you'll need to have reached Inazuma (the third region). Certainly not a waste in the long run, but he will be locked to lvl40 for a while, depending on how fast you progress.
One way or another, do their trials (in the main activity menu with other events) to check them out and get some basic materials for them.
My advice would be wait for next patch, and maybe wait for Fontaine after that. Or get Kazuha now if you think he will of use to you soon? No rush though.
Oh and
three five stars in seven rolls on the standard banner is astonishingly lucky, odds are probably of one in many millions
Tighnari is also the best DPS on there, while Dehya is widely seen as the worst... but that's not the case anymore with an extra copy since her damage then scales with her HP, which makes her a far more competent support.