avic d1 install

[boanna]

I am new to this forum. I just got a 2006 h3 with the six disk player and the monsoon system. I want to install the avic D1.
what do I need to install?
1. onstar/monsoon interface oso4 from auto toys? or
Pac OS-2?
2. Scosche GM1595
My current system already has xm do I need the pioneer unit?
3.
do I need Pac CM1 chime module or does the os04 handle that.

Is there anything else I may need?

Thanks in advance