Hi there June,
You need to post frequently. It takes weeks for search engines to index content in a new blog and/or to re-index content under a new URL. What attracts search engines is unique content the cannot in posts that cannot be found anywhere else on the internet. Start now publishing original content posts frequently two or even three times weekly. For more information read > http://onecoolsitebloggingtips.com/2010/01/21/omg-i-cant-find-my-blog-on-google/
The rule of thumb is to assign the least, not the most, combined number of only relevant categories and tags that accurately describe the post content. For tips on tagging see > http://onecoolsitebloggingtips.com/2013/03/15/quick-blog-post-tagging-tips/
To verify blog ownership of a WordPress.com blog with the major search engines you must use this process > http://en.support.wordpress.com/webmaster-tools/
Note: Even if you do not verify the blog the content will be indexed by search engines so don't feel panicky about this please.
Note also that WordPress.com automatically supplies sitemaps for our blogs to search engines - we do nothing. http://en.support.wordpress.com/sitemaps/#xml-sitemaps-for-search-engines