Summarize:

You don't have to use a gmail.com address to own a Google account, you can login to Google with just about any email address. For GMB to work, your Google Account must be associated with the location you are trying to add or  manage. If you do not have a Google account associated with your business, create one. This account will be linked to the Google My Business dashboard you are creating. If you do not have a Google account, click on "Sign in",  then "More Options" and finally "Create Account" at www.google.com. Follow the instructions to create an account. Click on the green box in the middle that says “Start Now”. Getting your business on Google will allow you to give your customers correct information about your business location, phone number, hours, photos and services provided. It will also enable your customers to give your business ratings and reviews, and read news that you post. Double check that the address and phone number match your business. This step applies if your business did not appear under the search results for “Find your Business”. If Google does not have your business listed, you will need to add the details of your business.  Click the category your business falls under. For example, “Attorney”. The category is extremely important for Google to rank your listing. It's very important to note that while Google offers more than one category for your listing it is preferable to choose only one. Using more than one will not help your ranking at all. Accurately fill in the details of your location. This will include the business address, phone number and the category you business falls under, for example, “bakery”. If applicable, make sure to check the box that says “I deliver goods and services to my customers at their location”. Then fill out the areas you serve by entering the city names or zip codes of the regions you serve.
Determine if you have a Google Account. Type in www.google.com/business to go to Google My Business. Enter your business name and address into the search bar to find your business on Google Maps. Click on the blue hyperlink “Add your business”.