If you do not have a Google Account, the first thing you need to do is Create a Google Email Address
Next, sign up for Google My Business listing for what your business is and follow the instructions as given in making your GMB listing. You need to complete all the information asked by Google and ensure every detail is filled including your business location, phone number, maybe a picture of your work venue etc.
Add photos and videos that customers might appreciate to see any products visually, or to see the whereabouts of your business.
Follow and read the guidelines as set by Google as they will very likely review every piece information you enter. The reason for that is they don't want misleading details and spam that are not relevant.
The nice thing about GMB is that it's very convenient for small or large businesses to use Google My Business to aid in increasing revenue and improving their visual presence online.
For android or IOS, you can download the GMB App in Play Store or Apple Store.