How do I gain shelf space for my nascent product in local retail stores?

I created a product that is perfect for sales in local speciality knick knack stores. I have packaged the product and created a small display. (7” wide by 12” long by 10” high). How do I approach small local retail stores and what should my strategy be? Should I convince them to purchase an entire display or do I just rent space on their shelves? I’m not sure how this works and how to initiate the conversation. Any suggestions, thoughts or wisdom out there for a just starting entrepeneur?