Your obsession on blogging
Google crawler likes sitemap to index pages, so your blog should have sitemap. Always check your sitemap time by time to ensure that Google is not encountering any errors in it. You only need to submit your blog once on Google; you don't need to submit again, but do not ignore your sitemap. For instance, if you host your blog on Wordpress, it is good to install Wordpress sitemap plugin which is a good tool that automatically updates your sitemap and send notification to Google. Google offers free sitemap creation tools, so do not worry if your hosting website does not offer you any software.