How should I configure properly my LAN to use IPv6 for communication on LAN and WAN?

Finally I have found the answer. Let's see what I have:

• pfSense is being used as a router/firewall on my LAN.
• I got Global Unicast IPv6 address from my ISP on my WAN interface. (GUIPv6 is routable on Internet.)
• pfSense need to be configured properly to get Global Unicast IPv6 address from the ISP on the LAN interface.
• Interfaces --> WAN --> DHCP6 Client Configuration --> DHCPv6 Prefix Delegation size="60" --> Save
• Interfaces --> LAN --> General Configuration --> IPv6 Configuration Type="Track Interface"
• Interfaces --> LAN --> Track IPv6 Interface --> IPv6 Interface="WAN"
• Interfaces --> LAN --> Track IPv6 Interface --> IPv6 Prefix ID="0" --> Save
• Services --> DHCPv6 Server & RA --> Router Advertisements --> Router mode="Managed" --> Save
• Services --> DHCPv6 Server & RA --> DHCPv6 Server --> "Enable DHCPv6 server on interface LAN"
• Range from="::1000"
• Range to="::2000" -- > Save

Abovementioned steps set up pfSense to be able to dynamically assigns GUIPv6 addresses on LAN.