Well at first you gotta believe it's possible, there are ton of people out there are crashing that numbers each and every day so it's possible. But keep in mind it takes lots of hard work and sweat to get there!
Even there are courses out there in which the creators of these course teaches people how to replicate their exact process to reach same kind of level. Here's eCom experts academy review about that topic which is the hottest course out there right now about building your ecommerce business.
They will teach you every steps of growing your business from finding products to dealing with shipping and sorucing people and most importantly they teach you how to market your brand to reach your target audience to achieve your income goals.
Shopify is most well known platform for that purpose also it offers lots of great deal of application inside of their platform. So you can get over all kind of obstacle with these plugins!