Hello team, I am trying to make a software that is able to control a LED in my arduino. The LED is simple connected to 13 pin. I have no idea how can i create that simple softaware though. I have developed some gui in java and C so i have skills but never done something like that in my arduino. Can anyone guide me a bit? I just want to have 3-4 buttons to start/stop blinking start/stop fading. Nothing more 
thanks!!!! 
I have no idea how can i create that simple softaware though.
How you develop the "softaware" depends on what programming languages you know. On the playground, there is a whole section devoted to interfacing with software on the computer. Find the section for the programming languages you are comfortable with.
It's already done in Ardulink. This video is my first video I've put in youtube an year ago. Ardulink is opensource so you can see how it works.
Luciano