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1) In order to create Logical Standby Database, do we need to create a Physical Standby Database first?What is the sense to ask the same questions? Can you open the documentation?
2) Why is supplemental logging needed in Logical Standby database?
3)Does the FAL_SERVER and FAL_CLIENT gap recovery mechanism works with logical standby database?
Yes we need to create a physical database first.
Supplemental logging indicates the source of changes to a logical standby database so it is necessary.
Please check this link : http://www.mahir-quluzade.com/2012/06/oracle-data-guard-11g-overview-logical.html