[Wlug] Network configuration with OpenLDAP

Hi, My goal is to set up a small business network that will have both linux and windows clients. I would like to use OpenLDAP for my authentication services. The problem is that I have never done anything like this and don't know where to start. I have read the docs at openldap.org, LDAP-HOWTO, LDAP-Implementation-HOWTO, http://www.kernel.org/pub/linux/libs/pam/Linux-PAM-html/pam.html and am not sure where to start. I would like to start by building the services that will allow me to authenticate users and configure file shares that they have access to. Which service(s) should I start with PAM, LDAP, other? Thanks, Mike