Can I use scenes and so on in my pack

I set my model in default scene, als scene and 3rd model scene, can I send all the scenes in my pack if it’s epic content?
2. I set the hair using M_Hair_Master shader from Digital human pack, can I use it same way by mention it’s not mine or not?

I suggest you read all of the information here: Marketplace Support

In short, as far as I remember, you can’t use assets which are not yours, unless you have the authority to do so from the original creator or owner.