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You do not need any oracle client installed, you do however need a database somewhere to connect to.
The credentials you require would be for this database, and so we cannot help you get them.
If you have a DBA that manages your databases ask him for the credentials.
If you are on your own and just want to try out something, your best option is to install an Oracle XE on your own system, then you can connect with the defaults SQLDeveloper already has when creating a new connection (the system password will be set during database installation so note it down), then you can play with your newly installed database.