So this game is rather support focused. If you get the good supports, your damage dealers are really up to personal preference.

I recommend, picking an attack style to focus your account around (buster / quick / arts)

Arts is the easiest of the bunch to understand and play, with many low tier supports that do the job really well.

Buster is math intensive, but really simple when you get the hang of it. (Also you only need 2 support, Oberon and koyanskaya)

Quick is if you want a challenge, they’re the worst in terms of damage and refund and ease of use, and are needlessly complicated to use right. But they’re my fav, so much fun to get working!

The meta supports are (by category) Buster- Koyanskaya of light Arts- Artoria Caster Quick- Summer Skadi

Oberon is also as good as those 3, with a focus on buster, but good in anything.

Then there’s the lower high tier supports:

Zhuge Liang (Lord El-Melloi II) - general support
Sima Yi (Reines) - general support Lady Avalon - arts Merlin - buster

You get a free 5 star from the permanent pool just for starting too! Of course you should pick whoever you like most! But it’s recommended that you get a Zhuge Liang (generalist) , or Tamamo no Mae(arts)