Becoming a domain name registrar is not easy — it requires a significant investment in capital and technology. (Let’s put it this way: If you need to read this page to learn about it, you aren’t qualified.)
However, that doesn’t mean you can’t sell domain names. Most people don’t buy domain names directly from the actual registrar, but rather from retail domain name sales companies.
To become a domain name reseller, sign up for a reseller account at a registrar like Enom