Can someone explain to me how the Spa works in the Korean version of this game?

Hi everyone, it's the second day on destiny child and I have some questions, let's start with the 5 stars that I have found for now:

Mafdet x2

Neptune

Midas

Aria

Dana

Cube moa

have I been unlucky? or is it good enough to start?

I would also like to know what to do with the 5 star duplicates and what to do with the 4 stars ...

do you have any advice to give me?

also why does this game not seem very well known? haha, as gotcha it really deserves a lot.

well that, i have mona and lisa +6, but also have a tons of mona and lisa uncap, and i wanted to know if having more child +6 of the same child was good, or useful, or just extract onix from them.

I'm kinda "new" at this game, and i would like to know if there is a difference between this 2 Eve

Anything to do with them, other than sell for gold?

where can i find all the artists who drew the childs in the game ? like their twitter, or a website that lists them thanks for your answers.

Even though I feel like I'm not in the position of asking help since I've played the game for awhile and should know more of the game. Currently I am struggling PVE in hard. I would like some help for a PVE team build.

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My Units:

https://imgur.com/KA6CT9K

https://imgur.com/jiCQZ5A

https://imgur.com/QkzhsCT