Migrating Oracle Database with expdp and impdp

Does the target database need to be prepared with tablespace and/or user (schema) in order to successfully migrate a schema from one database (11g R1) to another (11g R2)?

Currently I only can make tests with the 11g R1 database. My test was to export a schema and import it into a new schema within the same database.

expdp system/systempass schemas=oldschema

After that I tried to import it with:

impdp system/systempass expdat.dmp remap_schema=oldschema:newschema

But this leads to the error:

UDI-00014: invalid value for parameter, 'attach'

1. Does this error tell me that newschema is not defined?
2. Do I have to create a new user?
3. Do I have to create a tablespace for such a new user?

The questions also relate to a new installed 11g R2 database on a new PC. Any suggestions migrating a database to a fresh installed database are welcome!

"Does the target database need to be prepared with tablespace and/or user (schema) in order to successfully migrate a schema from one database (11g R1) to another (11g R2)?"

Tablespaces - yes. Users - no.

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UDI-00014: invalid value for parameter, 'attach'

I think the order of parameters is incorrect when calling impdp. Should be of the form:

impdp username/password DUMPFILE=<filename> [and then whatever other parameters you need for your import]

Since you're doing a "migration" I assume it's a full imp/exp, in which case you probably want:

impdp username/password DUMPFILE=<filename> FULL=Y

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With regard to your current test within the same db, I suggest you check-out:

http://psoug.org/reference/datapump.html

for a couple of examples