The core idea in building your business, is that your business should not require you. It should run on its own without you.
This is an important thing to keep in mind for distinguishing between having a job, and building a business.
If your business needs you, it is not a business yet.
The purpose of going into business is to get free of a job so you can create jobs for other people.
Start with the end in mind. Build your business as if you are going to sell it.
If you are going to sell your business, then it has to operate even when you are not there.