The best way to get started is to jump in the pool. You'll learn best by doing, playing, and experimenting.
Here is the link to the Figma workspace we've put together for you.
You will initially have access to the file as "View Only." You will need to make a copy ("Duplicate to your Drafts") to your own account. See the screenshot below:
After you've made a copy, please jump in and start messing around.
TRAIN if you ever get lost: Typography, Restraint, Alignment, Image Treatment, Negative Space.