Welcome!
Focus on working your way through Campaign in all 4 packs. Make sure you have both your lead wolves on your campaign team and that each of them has a Companion, also on the Campaign team. Leveling 2 wolves+2 Companions up to Lvl 10 (max) as soon as you can will get you off to a strong start.
With those teams you can then continue to farm Campaign for trinkets, food, items to sell from inventory back to vendor, and Wild Wolves or knucklebone tokens which sell well in the Flea Market (FM).
Many Companions drop pebbles when you play with them and the amount increases as the Companion levels up. Keep Companions on all your wolves and play with them when ready.
As mentioned above doing the daily activities bar is a great way to keep earning currency.
You will collect Moonstone shards from different professions - cooking, mining, hunting, etc- as you get more wolves and more food and trinkets you can keep rotating through these activities to get currency & things to sell. Every 10 Moonstone shards can be crafted into a MS when you get them.
There's a lot to do in the game! I suggest getting through all the Campaigns first so you can start playing and collecting things from the different venues first. Many of us farm in the second Icerun sword venue (Black Hills) as the owls are defeatable with 1wolf/1 companion both over Level 5 and they drop a lot of food and bones for crafting.
Work on cooking, fishing and mining at the very least so you can start leveling up. Gauntlet, Arena, and Hunting are better if you start those after a couple of weeks when you have more leveled wolves, companions, and experienced teams.
There's a ton of advice and help in the official Discord if you want to join there, and lots of Guides and tips in the Forums.
Good luck!