how to configure eb cli with eb env that is already running

I have taken over a project that has been deployed to elastic beanstalk. I would like to configure my eb cli to deploy to the existing environment without modifying that environment. From my research I get the impression that eb init is the proper command, however when I started going through the interactive session it seemed like it was going to use my entries as the configuration settings (e.g. platform version). I want to make sure that I maintain the settings that are already in use (I was unable to determine what platform version my running environment is using) and I want to make sure that the running ec2 instance will not be replaced or terminated for any reason. Does anyone know the best way to go about doing this? Thanks in advance for any help.