Offering Free Product & Shipping for Promotion

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I am working on an upcoming campaign for a client and one of the elements is free items for the first 500 users. We would like to use Shopify but was not sure how you go about giving an item away vs. selling on this platform. We also wanted to include free shipping. Is this something you can do on Shopify? Help. Pretty please. 


Also, can you generate unique promotion codes via Shopify (500 unique codes).