Please read what I post cery carefull as there are many misconceptions that prevail.
What’s critical is:
(1) a clear comprehension of the differences between pages and posts > http://en.support.wordpress.com/post-vs-page/
(2) a clear comprehension of the fact that 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.
Pages are static. They sit outside of the blog structure and you cannot post to multiple pages in any blog. There is only one main page for posts in a blog and all posts will show on the main blog page. There is no way to exclude posts from the main posts (blog) page.
We organize posts by assigning categories to them. Categories will not display until there is one published post in a category. You can create a custom menu and add the categories pages, which are automatically generated by the software when we publish a post (ie. they are not static pages we create) into the custom menu.
This is a link to a cutom menu walkthrough > http://onecoolsitebloggingtips.com/2011/08/11/wordpress-com-custom-menu-walk-through/
There are many common errors, misunderstanding and misconceptions when creating custom menus and you can read about them here > http://wpbtips.wordpress.com/2011/12/19/custom-menus/
If you do not want all the posts to show on the main page, then you can create a static front page for your site.
Choice 1 static front page.
Choice 2 running page for all posts on front page.
Which do you choose? It’s one or the other. If you choose Choice 1 static front page then you have to create two pages. One for the static front page which you can call anything you choose example “Welcome”, and one for the blog posts to appear on which you can call anything you choose example “Blog”. Adter your do that you go here . Settings > Reading and make the designation change and click “save changes”. http://en.support.wordpress.com/pages/front-page/