The patent application and review process is a legal process.
You need to make your formula public, write a patent application document, and then submit it to the National Intellectual Property Office for application and review. If you meet the authorization conditions of the patent law after review, you will be granted the patent right; otherwise, it will be rejected.
For product formulas, you can only apply for invention patents. The review process for invention patents is relatively strict. Therefore, it is recommended that you entrust a regular patent agency to help you handle matters related to patent applications.
As for the marketing and sales after patent authorization, it is up to you.