How to transfer data using expdp and impdp commands?

Question

I'm an Oracle noob, and my intention is to transfer all data and metadata from one schema to another schema within an Oracle database. I'm planning to use datapump's expdp and impdp commands. I have questions regarding this:

• Can I create a target schema without a user or should I create a user first (which creates a schema also)?
• Can I execute expdp and impdp commands using SYS (as sysdba) account? Is that a preferred method?

• Does this statement take all the objects (data and metadata) from a schema and move these into a different schema?

  expdp \"/ as sysdba\" schemas=<schemaname> directory=dumpdir dumpfile=<schemaname>.dmp logfile=expdp_<schemaname>.log  
  

  So is the target schema an exact copy of the source schema after impdp command?