Seriously, you don't.
You create the content and code for your website, using words and phrases that your target market are likely to use when they search for whatever it is you offer.
Then you start marketing your site. See if you can get a business colleague or a friend who has a website to link to your site from one of their pages. It's helpful if they're in a related (but not competitive) business, but it's not necessary. Mention your pages on social media. Include the URL on your business stationery. Advertise (online, print and broadcast, depending on your budget). Do what it takes to make sure people know about your pages.
Validate your site with Google Search Console (formerly Webmaster Tools) and with the Bing's Webmaster Tools. If there are any other search engines that are important in your part of the world, find out if they have something similar.
The search engines will find your pages on their own. You do not have to submit to them. In fact, given the backlog of submissions they're dealing with, they'll likely find you on their own before they ever get around to your submission.
Bottom line: submitting your site to the search engines is a waste of time. Spend the time you would have devoted to submission to promoting your site through other, more useful channels.