How long should you wait for paint to dry before applying a new coat?

Yes. Never close a case until restitution has been made. If you close the case the seller is no longer obligated to resend anything or refund you. You will also...

You should do both. Washing your face first gets rid of the excess dirt and oil, making the mask more effective. Washing your face afterwards gets rid of any residue...

You have to wait 10 game days.

Yes, but you may need to sand it down again beforehand to make sure the paint can still properly grip onto the leather.

Yes, the clearcoat comes last to protect everything underneath. Spray everything on before the clearcoat.

No, it should be dry in about 24 hours if it's a thin coat.

It really depends on how much snow there is and if you're willing to go out in the snow. If there is a medium amount of snow, such as 10cm/4inches...