This article will detail the process to create a new product.
To create a new product go to the back office application and click on the "Product" menu > "Add New Product" OR, better yet, search for an existing product and copy / duplicate it.
To duplicate a product search for it, open its properties, and in the upper right-hand corner click the drop down next to "Save" and choose the option to "Save and duplicate"
There are significant training videos on the topic of new product creation that outlines all of the intricacies of that process - we strongly recommend that you complete that training. Please see the documentation provided with your system for details.