With a B2C buisness how can it benefit from a social media campaign when my objective is to increase sales by 20

Question

with a B2C buisness how can it benefit from a social media campaign when my objective is to increase sales by 20

percent how do I Identifiy target audience,Description of a concept for the message (content) based on the target audience,Description of the social media marketing activities why the social media initiative is important and how it integrates into the overall marketing activities of the business

Marketing