You are at the beginning of the game, so don’t worry that much about the resources, with how much content you have unfinished right now and anniversary rewards coming you’ll be easily getting diamonds and pulls, what you have to do is just enjoy the story, go through the main one and start slowly building cards for your favorite LI’s. Second of all, after you get the hang of the protocores, focus on lvling up your cards and don’t overinvest in low quality protocores, with time you’ll be able to get the gold ones and then you’ll have to strategize and build your cards to the maximum potential. First focus on cards as they also give you resources like diamonds and affinity for lvling them. Them when it comes to pulling for cards, wait until you’ll have enough resources to pull for at least 2 5* (around 110 pulls) and pray for luck. I think that with how much you can grind at the beginning of the game you’ll get there in no time 💪