STM32H747 programming steps and programming platform

Hello, normally I use STM32F103 microcontrollers and recently got a STM32H747 Discovery Kit. However I have no idea how to develop a program for it or compile that program. Normally I use Atollic True Studio but I don't know if it supports this discovery kit. I could not find any information about that over the internet. So can someone answer these questions for me? I will appreciate it:

1) How can I program STM32H747 Discovery Kit and compile it.

2) Is Atollica True Studio supports this kit? If not what platform I can use similar to Atollic. ( I guess Keil supports it, but a free option would be better.)

3) Is there documents about where to develop programs for this kit and how to program them over the internet? All I could find are "Getting Started with STM32H747" which shows buttons and units on it.

Thanks beforehand!