If you have an Google account set up for the business then you are good to go, type in the phone number and see if there is any business information registerd before you get started.
If you don`t have a Google account set up for them you need to do so. If you don`t wan`t to sign up with a gmail account use this link https://accounts.google.com/NewAccount it will take you to this page.
If your local business does not have a keyword related email you can easily get one by signing up for a gmail account. Having a keyword related email can help your google place listing rank higher.
For example if the business is a chiropractor in Canton and that is the keyword you try to rank them for "chiropractor in Canton". If they don`t have an email address that is relavant to the keyword, you can get a gmail account set up for them, you then would want the keyword in the email address for example chiropractorincanton@gmail.com