With the dropshipping model you own an online store which stands between the customer and a supplier. Once customer orders from your online store, you send the order with the customer information to the supplier who in turn ships the order to the customers address.
You get paid before the supplier gets paid and you pay the supplier after an order is placed with the money that came into your bank account. You keep the price difference between your store prices and the supplier item price.
The best is – you determine what that price difference will be. You will determine the pricing formula you want to use in your store and you will apply one or more of these pricing formulas to your products.