First, you should give a short, suggestive name to your project.
Hint: multi-project version will always show
your current project at the drop-down box at the top.
At any time you will be able to create/add a new project to your current pool of projects
by simply pressing the "New" button at the right of the drop-down box.
All projects in the same pool will share resources/calendars/etc.
Make a concise description of the project scope. The scope statement will be an input data for the work breakdown structure you'll define later.