How to add table to database inventory in sqlplus oracle 12c Problems

How to create database Inventory database and inside it table Items in sqlplus
oracle 12c .
Details

Im beginner on Oracle 12c release
 i setup oracle and i create database Inventory

Now how to add table items to database Inventory

i can create table but how to create it inside database Inventorty
this actually what i need 

Create table Items
(
itemno number(4) not null,
itemname varchar2(40) not null
);
You either login as user Inventory before running the DDL, or you create the table by specifying the Schema like

create table Inventory.Items
( ... );