Action Details
Requirements and how-to articles for Facebook's action:

paid action
Create a video ad to appear in users' News Feeds.

You need this to get it done:

Video Specs
Ratio: 9:16 to 16:9
File format: .mp4/.mov recommended, but most video file formats supported.
Maximum file size: 4GB
Maximum video length: 240 minutes
Captions: Recommended
Sound: Recommended
Objectives supported: All
A short description to accompany your video (maximum of 90 characters.)
Target Audience
Choose the target audience for your ad (gender, age, location, interests, etc.)
Duration and Budget
Choose how long you want your ad to run and what your daily budget is.
Choose currency, enter payment details and pay.
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

Facebook Ads Guide - Video (Facebook feed)
Specifications and requirements.
Facebook Video Ads
Information about video ads - when and how to use them.
Link missing here or found errors? Improve How-Tos