IntelliJ + MXML Design View plugin + Flex SDK

Hello guys,

Do you know where can I get MXML Desing View plugin for IntelliJ?

And where could I get the Flex SDK for IntelliJ?

I am trying to build a mobile app with simple math formulas

Example:

A + B / 20 = C

But... I know next to nothing about coding, and I am looking for a program where I can do visual desing to add text boxes and values to make it work for simple formulas.

Thanks!