I fully agree with Kan and Dave, Kinetis Design Studio with the SDK is an awesome development tool. However..... There is a very steep learning curve to it. I do strongly suggest you take the time to learn it, but not now.
FRDM-KL46Z | mbed The MBED development platform is an online code editor and embedded components library. The Freescale Freedom boards, such as the FRDM-KL46Z are enabled out of the box to work with this development platform.
You can start by reading this --> FRDM-KL46Z | mbed
I won't say it's as easy as the Arduino IDE and associated libraries... but it is much richer in ability. The support community behind it is great, and there are plenty of example that will have you up and running on that board FROM a linux workstation within minutes.
Get used to working with the ARM libraries, and understanding your freedom board and it's pinouts and embedded components capabilities. Once you've become comfortable with MBED, then it's time to move up to the Design Studio to pull the real power out of your Freedom board.