You can use Generate Script option in SQL Management studio to generate script for selected objects. There are option to make script of 'schema only' or 'data only' or 'both'.

Step 1: Right click on your database then navigate to task >> Generate Script

Step 2: Click Next

Step 3: Since you want to generate script for whole database. so default option is ok. Otherwise you may select the particular database objects.

Step 4: Select appropriate option from advanced popup.

Step 5: Click next and your database script is generated as your selected option.

Please find this link for detail steps for generating script in SQL Server Generate Scripts.

There you find your option to save generated script in query window or clipboard or 'sql file`. Which further open in text editor for further use.