Ok, you have the database software installed. Here is the 11.2 Installation Quick Guide for Windows Here is the 11.2 documentation home. Now you need to install a database instance and start a listener. Then you need to create a connection in SQL Developer to the database instance.
Some essential tools during this are SQLPlus on the server. Enterprise Manager Database Control
http://host.domain:1158/em/ You will need to Remote Desktop into the server to perform database setup tasks as the SYS user. On the server DOS window:
SQL>connect sys@myinstance AS SYSDBA
enter your password.
If you did not create a database instance during the install, use Database Configuration Assistant (DBCA). A universal approach for client connectivity is to use a tnsnames.ora file located in
$ORACLE_HOME/network/admin. The parameters for this become the connection parameters in SQL Developer.
In a DOS window on the server, run the listener control with
lsnrctl status tells you which instances are running.
Once you have the instance created, create a new tablespace to hold your tables. Then create a user that will be the schema owner of the tables associated with that tablespace. It is a good practice to create a separate user for each person in addition to the schema owner. Then create tables, views, stored procedures, etc.
Hope this is enough to get you started. The links are good reads.