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

paid action
Promoted accounts (followers campaigns) suggest Twitter accounts that people don't currently follow and may find interesting.

You need this to get it done:

Twitter Ads Account
A Twitter Ads account is required in order to promote your account using a followers campaign.
Campaign Name
A name/title for your campaign.
Choose tweet(s) to use for your campaign (Twitter recommends choosing text only tweets for followers campaigns.)
Target Audience
Choose the target audience for your ad (gender/age/location/language/technology.)
Bid Type
Choose the bid type you'd like to use in your campaign (automatic bid vs. target cost.)
Budget and Funding Source
Set your currency, total/daily budget(s) and payment source.
Campaign Timeframe
You can either set start and end times for your campaign, or set it to start immediately and run continuously.
Requirements missing or found errors? Report

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

Twitter Business - What are Promoted Accounts?
Official information on promoted Twitter accounts.
Twitter Business - Create a followers campaign
How to set up a followers campaign.
Link missing here or found errors? Improve How-Tos