Speech
Many would say Notepad but if you're looking for the easiest program to script with, that would be Torsion. It's a wonderful IDE that does many magical things. It practically does the scripting for you!* Check it out, it costs money but there is a free trial. I loved it while I could use it, but easier Blockland scripting is not worth $30-$40. Have fun!
*no it doesn't
Edit: also, scripting is not a general thing you learn. In scripting and in programming, there are many different languages that have their own unique syntax that you have to learn. It gets easier after your first language.