In response to #1:
As you are writing a post, notice just below the input box for the title of your post, a toolbar with a line of symbols. The first is a bold letter b. (For bold.) The next is an i. (For italic.)
Later in the set of tools you'll notice one that says 'more'. That's the one you want.
As you're writing your post or once you're finished writing, decide where you want the post to end on the front page and continue onto another page. Put your curser there and click the 'more' button.
That takes care of it.
When you 'publish' everything up to the 'more' code you inserted will show up on the front page. The rest will go on the permalink page.
Now, you might want also to only include the first part, up to the 'more' symbol, in your rss feeds. To do that, copy that part, including the 'more' code, and then paste it in the 'optional excerpt' box deeper on the 'create a post' page.
(Be sure to include the 'more' code so that those receiving the rss feed can click and read the REST of the piece.)
Hope that helps,