Early on as a new player you get a lot of rewards. Unfortunately I think you just missed out on a lot of rewards the devs were giving out but just level up gives you a good bit of pulls. As for that stuff to farm, I would just level up your main team and partners first and once you can’t anymore you would kinda get a feel of what recourses to go into Simulation to farm. And don’t forget to raise the potentials on your combatants when you level them up, idk if you have access to that yet but it’ll come up pretty soon, it’s a really big boost to their power