Drafts can be found in the last tab on your Timeline. Posts that have been Queued past the two week window automatically become Drafts.
Drafts can be created manually from the Posting Window, by hitting the down pointing arrow on the right of the "Post" button, then selecting "Make Draft" instead. This will change the Post button to Make Draft. Hitting the button will save the post in your Drafts tab.
Drafts will never get published until you set a time for it to post. Once you think it's time for the community to see your post, you can use the Publishing Options to set a date and time for the Draft to get published