Creating Item
To create this type of item you need to create a new Product or used the one you created before. to create anew object go to theme Products > Add Products
Add new products
Please check this documentation for how to create a Woocommerce products. The features added in {theme} you will find in the Product Data > General
Product Availability
Via Availability option you will be able to set the months when your customers should expect your fresh products in the shop!
After every modification click on Update to keep your changes saved.