First thing you want to do after creating your new document is to Save.
Step 1: With your newly created document open, go to the Apple Menu > File > Save As…
Step 2: The “Save As” window will appear prompting you to save your file. To expand the view of where you will save your file click the down arrow next to the “Save As:” dialogue box.
With this expanded view open, locate where you wish to save your file, give your file a name (only change the highlighted section before the .ai), and click “Save.”
Upon clicking “Save” another window will prompt you with additional options, at this point just click “OK.” If you were going to be using a older version of Illustrator, say at home, this is where you would select the version.
