create database character set AL32UTF8 national charset UTF8

The easiest way to get a create database script that you want is to run the  Database Configuration Assistant (DBCA) tool, select all the options you want including the correct character set and at the very end you have the option to save the statements as a script.

https://docs.oracle.com/database/122/ADMIN/creating-and-configuring-an-oracle-database.htm#ADMIN-GUID-99A93810-62B1-4707-9995-89B3D0B5FB56

If you want any old script, google around for samples and change the characterset in whatever script you find.

Ok I know DBCA but I search a script thanks

I do not understand what you are asking.  If you are searching for samples, just google:  oracle create database sample scripts

I search to know if it's possible to create database character set AL32UTF8 national charset UTF8 so having sample script thanks

thanks regards