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I would recommend writing a simple package and building it first. Use this tutorial for creating a simple package. If you think that this is confusing then do the following.

1. Go to your ROS workspace and src folder in it and type (You can exclude either roscpp or rospy depending upon the language you are using): >>catkin_create_pkg my_package roscpp rospy
2. If you are using catkin build the type: >>catkin build my_package

else go to catkin workspace and type:

catkin_make

You would have created the package here and built it.

What commands in writing a publisher are confusing? Once you are throrugh with this, then go for setting up the environment for eclipse.