The fastest route to a populated video feed is content you already made.
Existing Reels are audience-tested content, which makes them a better starting library than anything shot specifically for the storefront.
Not every Reel transplants — feed content is made to stop a scroll, product-page content is made to resolve a doubt.
Rights are the step most stores skip: a creator agreeing to a social repost has not agreed to commercial storefront use.
Import once and the work is done; import badly and you have fifty untagged videos and no product links.
Content you created yourself, featuring people who consented, is generally straightforward to reuse.
The full guide has the formats, the deadlines and the worked examples.