You have two solution :
1. Sell product online, physical goods (ecommerce) or virtual goods (like subscription or anything virtual).
2. Sell advertising. In this case you can use a lot of programs like google ads.
If you choose to sell ads you must have at least 1000 visitors a day to earn enought money. And if you choose the ecommerce solution you must have enought money to buy a first stock of goods.
If you have others questions I can help you
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