I know that you may not need this info anymore , but let me post it for newbies that search for info :

you have to initialize you slapd with an ldif that contiains intitial domain , group or anything else : 

 like :

dn: dc=esprit,dc=tn
dc: esprit
objectClass: domain

dn: ou=People,dc=esprit,dc=tn
ou: People
objectClass: organizationalUnit

dn: ou=Groups,dc=esprit,dc=tn
ou: Groups
objectClass: organizationalUnit

# Engineering Department
dn: ou=Engineering,ou=People,dc=esprit,dc=tn
ou: Engineering
objectClass: organizationalUnit

# Admin Group
dn: cn=Admin,ou=Groups,dc=esprit,dc=tn
gidNumber: 502
memberUid: admin
memberUid: admin
cn: Admin
objectClass: posixGroup

# Admin User :
dn: uid=dali,ou=Engineering,ou=People,dc=esprit,dc=tn
sn: dali difallah
userPassword: BJsRlQT3MmAYL+HluuVVwkWX4UM96yXQ
objectClass: shadowAccount
objectClass: person
uid: dali
cn: dali difallah

# Admin User : admin
dn: uid=admin,ou=Engineering,ou=People,dc=esprit,dc=tn
sn: Admin User
userPassword: BJsRlQT3MmAYL+HluuVVwkWX4UM96yXQ
objectClass: shadowAccount
objectClass: person
uid: admin
cn: Administrator

you can refer to http://blog.javachap.com/index.php/installing-openldap-on-centos

 thats not the same thing but it give you better idea

also , a cummon problem , when using a used domain name : .com .net .fr .de .net .   ...... remember to disable name resolution to avoid : SASL/DIGEST-MD5 authentication started
ldap_sasl_interactive_bind_s: Invalid credentials (49)

 (comment your /etc/resolv.conf entries)