The movie Introduction to Scripts - 6.5 minutes shows you how to learn scripting basics.

Types of Scripts in RAMP introduces you to RAMP scripts.

You also need to know how to Generate Scripts Automatically because this is how most scripts are created

The movie Reading, Writing and Storing Values in Scripts - 4 minutes shows how to pass values to and from your screens.

Javascript Essentials teaches you some basic techniques you will often use when writing scripts.