A:AnswerYes as long as the headset is bought before January you will get Asgards Wrath 2 for free.
Also if you get it before the game actually releases it counts as a pre order for the game too. So you will get the pre order bonuses the game offers as if you actually bought it, like asgards wrath 1 full game for free along with a couple other small things.
A:AnswerYou may play any Steam game that supports VR directly from your PC, Im pretty sure it does not allow like call of duty, or siege since they dont support VR.
A:AnswerFor the games, that is up to you. For the Meta Quest Headset, you cannot have an account that is set up for a child under 10 years old. You can set up an account and have the child play on that though. It is up to you.
A:AnswerYou can move the lenses using the IPD wheel, but you cannot change the depth, and you cannot change the depth on them. You can only make it farther or closer to your face by using the facial interface. It is sometimes tricky to move but if you want to move the lenses freely like it works on the Quest 2. It does not work like the Quest 2.