If you prefer to alter content rather than create it, then you can import a set of dummy products data for your shop. This will allow you to get a feeling for how things will look once filled with custom content.
To insert Demo content Do the following:
In the main WP admin menu, go to "Tools>Import"
Specify the type of import to be Wordpress
A plugin will be downloaded and installed if it did not already exist.
You will be asked to specify a dummy content xml file. This can be found in the root folder of the WooCommerce plugin. The file name is: "dummy_data.xml"
Once found, import that file and that's it.