Creating sitemap is easy, please follow the below steps to create a site map and submit the same in Google console. Create an XML sitemap that can be submitted to Google, Bing, Yahoo and other search engines to help them crawl your website better.
Go to the below URL
Enter the details in the sitemap generation input options
Enter your full website URL and some optional parameters in the form
Click on Start button and wait until the site is completely crawled.
Once your site is crawled it will be redirected to the generated sitemap details page.
Download the sitemap file under Download Sitemap.
Then upload the sitemap file to your website file server.
Go to your Google Webmaster account and add your sitemap URL.
Then click on Sitemap (see below picture)
Click on ADD/TEST SITEMAP button and then enter the sitemap file name in the textbox.
Click Test to verify your sitemap, then click submit.
You are done.