If you want to do a business, whether it is an online business or offline business, you are basically doing two things: one, you are selling services; two, you are selling products.
In order to sell services, you need to become a service provider or hire people who have relevant skills. For example, a law firm sells services. In order to start a law firm, you need to be a lawyer yourself or hire lawyers.
In order to sell products, you need to either acquire products or develop your own products.
You need more money to start a business to sell products compared to a business that sells services.