Search engine bots are very eager to search your site for new content; the moment you submit a new entry, it gets indexed ( provided that your site is already spidered by them).
It is important to update your site as much as possible, and as close to your blog topic as possible. Let us say for example a travel blog, you should be updating it at least twice a week with travel posts, so as to enrich the content of your blog. Specifically, you should also be including keywords and tags that revolves around the theme of your blog.
To have your post have weigh in search engines, you can submit this to article submission sites (there are lots of free of them out there), or to an Article directory. That would surely have your post returned in the first pages with the search keywords you are targeting. Well you also have to design your keywords and optimize it in relation to your site so that it would really have weight.
A tip: have your keyword in your post title, and in the exact URL. You could have the latter by downloading a plug-in for SEO. I am a WordPress user so I am using the plugin All in One SEO. I do not know what it is for Blogger.
