Can be done a couple of ways ... set view permissions in the page settings so that admin users only can view the page, or other private roles you may have created. Or, further down in page settings, make the page "hidden".

Doing it the first way makes the link to the page appear in the normal place (only for those who are logged on and have access to it). If it is hidden, then you have to access it via the Admin | Pages (or Tabs) link to get to it.

not sure about what you mean by "sent live" but what I have described here allows you to create pages which the public can't see, and then make them available to the public when ready.