Your first initial step is to determine your progress. Ask yourself what and how much you have done. Whichever answer you come up with, use a practical SEO tool to conduct in-depth site analysis. Some of the things to look out for during a site audit include broken or missing links, website usability (user experience), web page load speeds, and ensuring all your meta tags are in order.
One of the practical and essential SEO tools to use includes Search Crawl, which efficiently crawls your site for potential errors.
Once you have done a site audit and rectified all errors, start your keyword research, and embark on creating awesome content on your site.