If you haven't already, get the Nails Command Line Tool. This is by far the easiest way to manage your Nails installations:
$ brew tap nailsapp/nailsapp
$ brew install nails
If you're using an OS other than OSX you can still do things manually.
To set up a new site, get yourself to the appropriate parent directory, create an empty database and then:
$ nails new myAwesomeSite
This will create the project directory, clone the Nails skeleton and then bring all your dependancies and database up to date.
Finally, click through to the URL you defined (remember to set up a virtual host if needed) and you'll see the Nails welcome page.
Jump in and start editing
application/views/home.php and you've got a basic static site.
Upgrading Nails couldn't be easier. Simply use the Nails Command Line Tool; all your dependencies and database will be upgraded in one fell swoop.
$ nails upgrade
As with any automated upgrade process, be careful. It is highly recommended that you backup your database before upgrading, so that you can revert should things not go to plan.
The Docs are in the process of being written, thus are incomplete and ever-changing.
Your best bet for now is to get an installation running and then emailing us with questions. We'll do our best to answer promptly, however we are a full time agency so please bear that in mind before you start sending the trolls.