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You can also buy stuff in the shop, for example potions and packs when the sale starts I guess. Regarding being stuck I would suggest to concentrate more on getting to Bronze II and then do quests as secondayry target. I started the same way and tried to make all daily quests first but after trying to just win the battles first my win/lose rate got better. At least I am in Bronze II now and rewards get better there.

will try this. thank you!

will try this. thank you!

You can use credits to purchase and rent cards. I was really fortunate to receive 6600 credits from the daily chest.

thank you!

Your not the only one i still havent worked out what they are for yet but i know they start to accumilate.

yep. I know I could use them in the future.