If you ask me then I'll always recommend you to make at least a single site because it's like a pass for major earning sources.
- Research about the niche You are most fimiliar with it
- find a related available domain OR any domain that you think best fits for your website
- Start Writing articles
- Keep performing activities on FB, Twitter, Pinterest and other Major Social networking accounts.
- Search for the affiliate OR if you're niche is Adsense safe then apply for adsense.
- AND keep promoting Your website's Posting articles on Social networking sites.
In this way you'll get traffic AND how much traffic you'll receive, there will be more chance of Income...
In the meantime keep reading about SEO.. as Seo is the process to get Organic traffic from SE's