There is so much information on everything Wordpress that you don't need to ask this kind of question here.
Hello Sigit, I personally install, google sitemap generator, all in one seo pack. These two will help your blog to get into Google. But installing plugin won't be enough, we must submit our blog, to directories, webmaster tools, etc, for more infos, do some google researches. Hope that helps to get you start it.
you can add new plugin in wordpress admin, for fast indexing choose privacy allow google and technoraty to index
The plugin that can help you to get quickly indexed in Google is Google sitemap and All in one seo or Platinum SEO Pack. Apart from this you can also add your site as your forum signature.
Go to your dashboard, then click on plugins and click add, then enter "XML sitemap", then click download and install, it should install right away then configure it and post a thread, leave it for ten minutes and check the sitemap is working correctly then submit it to Google through webmaster tools.
enter to your dashboard and go to plugin and click "add new" then search these plugin; "all in one seo pack", "google analytics for wordpress", "google xml sitemaps", and "Bridge SEO Tag Wrap Keywords" install, activate and set it, those plugin is good for ur site,
Follow the process as optionplus states above, don't forget you can bulk activate plugins and the plugin which alerts the SEs of your blog, particularly the big G is google xml sitemaps. Pinging also alerts the SEs, but let your blog do that - don't overdo pinging, not a good idea.