-How big should my pack be?Packs should remain relatively small until you reach ~Level 5. This gives you time to focus on building your alphas with CP instead of blindly guessing which wolf needs what.
-How many pups do females typically have
Your pup count is determined by the father's Charisma and the mother's Maternal. The max amount of pups in a litter is 3. It can be 4 if you purchase a Dandelion in Barter > Apples.
-How do I heal a injured wolf?
Search for potions who's descriptions match your wolf's injuries. If you just need to up their health, purchase a regular Health potion from Barter.
-What's a good amount of mushrooms to have?
100 mushrooms isn't that much, really. Try to stick around the 1,000s. This can be done by hunting mythical creatures in explore and selling the items they drop. If you feel the need to, 1000 mush can get you a decent battle wolf.