If set isn't created, create him.
Open «Store» - «Products» tab - in left sidebar open menu item «Sets» and press «Plus» button.
Create set with id set/new. How to specify set id.

When the set with id set/new is created, drag some products into it and these products will be automatically published here — right on your storefront homepage.

If set isn't created, create him.
Open «Store» - «Products» tab - in left sidebar open menu item «Sets» and press «Plus» button.
Create set with id set/discount. How to specify set id.

When the set with id set/discount is created, drag some products into it and these products will be automatically published here — right on your storefront homepage.