The process of implementation is the same for every company regardless of the type of business and processes.
First, you need to have the top management on board for this project, because without their support it would be impossible to implement the standard. Next step is to perform a GAP analysis in order to determine to which level your company is already compliant with the standard and what needs to be done to achieve the full compliance.
Then, it is the best to set up the implementation as a project, to clearly define all the tasks and responsibilities for the tasks as well as the deadlines. Once you create all necessary documents and implement the changes in your processes, you can conduct the internal audit and management review and then your company will be ready for certification audit.
As far as E2 shop system is concerned, this information just need to be included in your documentation and particularly in your sales proced ure.