Below is the step-by-step process. You can follow it or create a course around it and sell.
1. Get a skill related to internet marketing.
2. Provide that skill to a few people in exchange for testimonials.
3. Create a website to showcase your portfolio.
4. Get active on social media and share content related to your skill.
5. Send emails, call, and meet local business owners to offer your service.
6. Once you are good at your skill (usually takes 3-6 months), you don't even need to sell it. People on social media will approach you because you know and share useful content. They see you as an expert in the field and want to work with you.