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You can easily check the which version of oracle database you are use. Execute this statement to find this. SELECT * FROM V$VERSION       *** This will give you detailed version number of the database components. 

Nomachine is a software which is connect linux operating system from windows operating system. Here run-nomachine-software

Use the CREATE USER statement to create and configure a database user, which is an account through which you can log in to the database, and to establish the means by which Oracle Database permits access by the user.

Here provide a step by step guideline for Oracle APEX Installation ... This installation guideline created by MR.  Noor Alam. I will give a thanks to  Mr.Noor Alam for Oracel APEX Installation guideline.