Export dumps are not a physical backup. This means you cannot use the data in the dumps to directly restore the database's physcial datafiles. Assuming you have a full database export, you can simply blow away your entire database, re-create the database and then perform a full import. The full import will create any necessary users, tablespaces and everything else.
Once you have your database up and running, it is vitally important to implement a sound backup and recovery methodology. The Backup and Recovery Guide has tons of information to get you started. Additionally, the Oracle Backup & Recovery Handbook by Velpuri & Adkoli on Oracle Press is a great reference.
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