You need this to get it done:
Action DetailsRequirements and how-to articles for YouTube's action:
Set up Google Ads account
Create a Google Ads account to be able to create video ad campaigns on YouTube.
Create Video Campaign
Enter the information for your campaign (name, budget, locations etc) and choose a video to use. If non-skippable, must be no longer than 15 seconds. No limit on skippable ads, but recommended less than 3 minutes long.