adding option at the checkout

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I just launched my store in shopify and because my products are being paid when customers receive their products, I would like to add an option at the check out telling customers " you need to pay 50% of the products to process your order". I need the 50% to be a $ value from the total amount in the cart (e.g if the cart has $100, the 50% is shown $50). I just need it to appear like a message. My website does not handle online payment (credit card) yet but I am allowing customers to proceed on to have their requests in the inventory.  I am using Kalles theme

Appreciate any help,