As of the newest material for D&D 5e, these features need not be spelled out fully, but shall all be mentioned briefly. Your Ability Scores are decoupled from your race, as you choose one ability score to increase by 2, and one different ability score to increase by 1. Alignment and age are relative to your character. As a wulfkin, your size is Medium, and your walking speed is 30 feet.

You have sharp teeth and claws, perfect for hunting prey and defending yourself. You have two natural weapons, that you are proficient with. They have the Finesse and Light properties, and can be treated as monk weapons. On a hit, it deals 1d4 plus your Strength or Dexterity modifier in either Piercing damage (for a Bite), or Slashing damage (for a Claw).

Additionally, you can use your bite attack to make a Two Weapon Fighting attack even if both your hands are occupied, and if you make an opportunity attack using a natural weapon, you have advantage on the attack roll.

You have advantage on attack rolls you make against a creature that has an ally of yours within 5 feet of it, provided the ally is not incapacitated.

You can communicate simple ideas with beasts. This does not grant you the ability to understand beasts directly, but you can perfectly understand a beast's emotions and feelings.

You have advantage on Perception checks you make that rely on hearing or smell. Additionally, you always know which way is north, and taking the Search action on your turn requires no action for you.

You gain proficiency with one tool and one skill of your choice. Furthermore, you have advantage on Survival checks you make to track a creature.