You need this to get it done:
Action DetailsRequirements and how-to articles for Twitter's action:
You can either set start and end times for your campaign, or set it to start immediately and run continuously.
Twitter Ads Account
A Twitter Ads account is required in order to promote your account using a followers campaign.
A name/title for your campaign.
Budget and Funding Source
Set your currency, total/daily budget(s) and payment source.
Choose the target audience for your ad (gender/age/location/language/technology.)
Choose tweet(s) to use for your campaign (Twitter recommends choosing text only tweets for followers campaigns.)
Choose the bid type you'd like to use in your campaign (automatic bid vs. target cost.)