This one helped me a lot.
http://coewww.rutgers.edu/www1/linux.../lecture8.html
I also had this one in my bookmarks which is slanted towards the Windows side but has sasl stuff in it.
LDAP
Once you get LDAP installed and you understand it a little the rest is easy. Until I found a basic tutorial I was at a loss because the reference material I found assumed you understood how LDAP was laid out.
Once you get LDAP up and running and can query data use my post #5 to see the attributes you will need. The include statements go into your slapd.conf file to include schemas. All four are needed but at least you don't have to define your own.
When you get that done let me know if you need more assistance.