I bought a new Apple Watch but it doesn’t tern on

Apple watch will not turn on or charge

The article If your Apple Watch won't charge or it won't turn on - Apple Support

is the best resource for this situation. If you've completed that troubleshooting and the issue is still not resolved, use the link in the article to Contact Support.

If this is bought from a non-Apple approved store or source I would return it for a refund.

By the way the most recent Apple Watches have no plastic film or packaging on them

So it maybe isn't recent stock.

Where did you buy it?

What model?