How to change $ROS_PACKAGE_PATH [closed]

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Hi, there.. I'm new using ROS and I'm doing the tutorial for creating a package (http://www.ros.org/wiki/ROS/Tutorials/CreatingPackage). I tried to do "roscreate-pkg" and I got this

 jesus@ubuntu:~/ros_workspace$ roscreate-pkg prueba1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
WARNING: current working directory is not on ROS_PACKAGE_PATH!
Please update your ROS_PACKAGE_PATH environment variable.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Created package directory /home/jesus/ros_workspace/prueba1
Created package file /home/jesus/ros_workspace/prueba1/Makefile
Created package file /home/jesus/ros_workspace/prueba1/manifest.xml
Created package file /home/jesus/ros_workspace/prueba1/CMakeLists.txt
Created package file /home/jesus/ros_workspace/prueba1/mainpage.dox

Please edit prueba1/manifest.xml and mainpage.dox to finish creating your package
jesus@ubuntu:~/ros_workspace$ echo $ROS_PACKAGE_PATH
/opt/ros/electric/stacks

So I realized that my path is placed in root and I want to move it to "/home/jesus/ros_workspace" How can I do this? Thanks