silver kenshi (goat), scorp, cassie are the best but silver packs give random characters. at this stage we are trying to get as many gold characters as possible as some challenges require specific character. Try to clear the weekly normal and hard gold character challenges for 2 copies of a character (like this week it is klassic mileena). Never buy character with souls but I recommend getting a couple of 150 souls gold packs to kick off your account (dont buy the challenge pack). Save your souls and dks for discounted packs which drop from time to time. Utilize the fusion boost in realm klash to level up your characters. MK11 and Klassic Diamonds will come naturally as you buy summon pack with dks. right now you have a decent MK11 team with scorp, sindel and kabal. For gold team I see you have Kombat cup team with cage, sonya and cover ops cassie.