Need help for Modify MIUI 6 ROM topic

Hi
All Dev There

I am a noob and want to learn some basic ROM editing. :D
I need some help on customising MIUI6 Unofficial ROM. I need to edit or add some features on that rom

1. PA Style Card Stack Recent UI (Lollipop recent UI)
2. PA Peek Function
3. Hiding Music player in Toggle Screen (Editing Whole Toggle Screen)


SO HEREBY REQUESTING ALL DEV TO HELP ME OR GUIDE ME FOR ROM EDITING
I HAVE INSTALLED ANDROID KITCHEN and APK Tool. Also I am unable to find SystemUI on MIUI ROM

xda-developers