Too many variables to give an accurate answer. If you are selling physical products and need to keep track of stock and delivery status, or you are interested in multiple orders per customer or have complex relationships between products I would look at traditional relational databases. If selling digital or virtual products and you don't need to track customer history look at document based databases like firebase or MongoDB. MySQL and Postgress are open source relational DBs. MSSQL has a free Developer edition you can install locally and starts at around £10 per month on Azure and will scale in size and geography with you markets.
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Too many variables to give an accurate answer. If you are selling physical products and need to keep track of stock and delivery status, or you are interested in multiple orders per customer or have complex relationships between products I would look at traditional relational databases. If selling digital or virtual products and you don't need to track customer history look at document based databases like firebase or MongoDB. MySQL and Postgress are open source relational DBs. MSSQL has a free Developer edition you can install locally and starts at around £10 per month on Azure and will scale in size and geography with you markets.