Hello and Welcome to LinuxQuestions,
Have a look at this
LDAP Tutorial. That will get you started. LQ is all about helping out others with Linux and Linux related questions and problems but you'll hardly find any user who will give you a step by step guide. You'll have to put in the work, Google a lot and when confronted with doubts, questions or problems, that's when you come to LQ for answers. Also when asking a question it's always good to mention what distro and version you are using so that we know from the start with what commands and package manager you are familiar.
Kind regards,
Eric