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1. Is only user directories and mail queue dir are the things should be in shared storage or anything else is there
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Depends on the size of your setup (How many users), I only have user directories in shared storage.
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2. Any Best Practices are defined for doing postfix mail server clustering?
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just needs careful mail routing (esp on failover)
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3. And any other things i should consider before starting or any dependencies over there on doing like this?
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virus scanning, spam checking, authentication, aliases (virtual and local), delivery (local or forwards to another server), users mailbox access (separate imap/pop server or direct from your postfix, webmail)
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4. For dovecot any thing dependencies are there?
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auth (ldap, or etc)