You are online because you want to be found by people over the internet. That is an assumption. However, it applies to most cases.
To be found over the internet, your site has (is almost obligated) to be registered on at least one search engine – Google being the most important one.
You have to create an XML sitemap for your WordPress site and submit it to Google. There is a Google XML SItemaps plugin which accomplishes this task in a very user-friendly way.