Designing for Apple Watch?

I’m brand new to this list and have only had my watch since Christmas. Is there a specific design portal for Apple Watches out here? Please point this newbie in the right direction…

You open Facer - Thousands of FREE watch faces for Apple Watch, Samsung Gear S3, Huawei Watch, and more
You login onto your Facer account.
You select what kind of watchface you wat to create (apple or android).
You create it using web creator and upload it onto your watch.