Need help for my team setup (JP)

First, I think this site is more focused on NA content, so it's kinda odd if you're asking about JP knowing that NA is almost 2 years behind JP content. Now for Team setup, there are some examples already on this site (Buster Blitz, Staple Quick, etc), looking at your rooster, you can use Karna or Achilles as your main damage dealer (because SSR will be better in general) accompanied with support like Hans and Mash. Raise all of your low star as well, they have some niche that your SSRs doesn't have in some situations, like Cu is great soloist, Robin is good Nuker, Euryale is deadly male killer, and so on. Since your new, just keep progressing and levelling your servants, and you'll find your optimum setup eventually.

Let's see

Karna with Enforcer + Hans + Leonidas is good

Robin/Euryale + Mozart + Hans/Mashu can nuke a lot of things

I haven't used my Achilles yet, so, dunno how he really works, but it seems like he will fit quick teams or crit teams easily. Alexander with his 3rd skill, support MHX Alter, Wu Zetian, Osakabehime or even Maid Artoria can support him.

Wait for Georgios to drop in FP Summon, he is the perfect partner for Siegfried.

Cu is an anomally since he is great when he is alone rather than in team, just put him at the very back of your party, he is gucci.

Billy works in dedicated crit/quick team, but you lack more star gens so wait until Fuuma or Hassan comes.

I guess that's that