I would use 'sticky posts' for that. In post editor under the 'Publish' headline you find 'Visibility: Public'
here you can edit a post to 'Stick this post to the front page'
Try this with any post you want to show on frontpage, they should line up there on top of other posts.
The crucial part: I guess they will line up (or appear) in Headlines and Featured too! You do not want this so you have to edit index.php in the queries for Headline and Featured.
To exclude sticky posts being included at the beginning of Headlines and Featured you have to tell wordpress to return posts in the natural order. The parameter you have to add is: "&caller_get_posts=1"
The headlines query looks now something like this:
<?php query_posts("showposts=1&category_name=Headline"); ?>
modify to:
<?php query_posts("showposts=1&caller_get_posts=1&category_name=Headline"); ?>
Featured with modification:
<?php query_posts("showposts=4&caller_get_posts=1&category_name=Featured"); $i = 1; ?>
Tell me if that works, I use it in http://themes.go41.de/?wptheme=aranovo2
Another way would be to set any page as 'static frontpage', but you have to create a complete new frontpage etc...