It's critical that you understand two things:
(1) All the differences between posts and pages ie. Pages are static and sit outside the blog structure. They can only be updated by editing them and have very little Google juice.
(2) You cannot post to pages. There is only one dynamic page in a blog for posts and we cannot post to more than that one page. But we can create the appearance that we have posted to more than one page.
Staff have provided help for those who want to structure their blog like a website. > http://en.support.wordpress.com/using-wordpress-to-create-a-website/ But we can create the appearance that we have posted to more than one page.
We organize our posts by assigning Categories to them. When we publish a post it automatically appears on the running page for posts and also on the Categories pages and Archives pages. Note: There must be one published post in each Category in order for there to be anything to display.
A custom menu allows you to display Categories with drop-downs to sub-categories in tabs along the horizontal navigation where normally only Pages tabs are displayed. If you wish you can also include Pages with drop-downs to sub-pages and custom links in your custom menu as well. You choose the order in which to display the foregoing in your custom menu. You choose which to display and which to hide. How to create a custom menu.
Also note that if you do not want all the posts to show on the front page, then you can create a static front page for your site, and also create a “blog” page for your posts to display on, but that’s optional.
As far as attempting to game Google search spiders goes, for the first 3 - 6 months your blog will be in the Google sandbox. Also note what this Types Of Blogs page states:
Blogs that violate our advertising policy or fall into one of the following categories are not allowed on WordPress.com: ... SEO blogs: Blogs that are written for search engines instead of humans. These blogs are dedicated to trying to fool Google and other search engines into ranking them or the sites they link to highly. WordPress.com is not meant for this type of activity.