1 Apple ID only for music, 1 Apple ID for iCloud

Am I doing it right?

Dear All,

I keep all my music on a Mac Mini directly linked to a Weiss Converter and to my Burmester. I would like to maintain everything sync on iCloud, nevertheless, I would like to purchase music under a separate Apple ID as you can't stay logged into the store and I don't want to disclose my PW to whom downloads music from the iTunes at home. Currently I had 1 Apple ID and Music Match.

Steps that I took:

1. Created a new Apple ID which I used as iTune store account. DO I HAVE TO CREATE A NEW iTUNES MATCH OR CAN I TRANSFER IT FROM THE APLE ID THAT I USE AS ICLOUD?
2. I changed only the music preferences on my iPad and iPhone inserting the new Apple ID. DOES THIS ALLOW ME, WHEN I PURCHASE MUSIC EITHER AT HOME OR VIA IPHONE OR IPAD, TO HAVE IT AUTOMATICALLY DOWNLOADED IN MY HOME MAC?
3. WHAT HAPPENS TO THE ALREADY PURCHASED MUSIC? IF I ACTIVATE A NEW MUSIC MATCH ON THE NEW APPLE ID, WILL THIS AUTOMATICALLY CONSIDER THE WHOLE LIBRARY THAT I ALREADY HAD PLUS THE NEW MUSIC DOWNLOADED? IF I WANT TO HAVE THIS MUSIC ALSO ON MY MACBOOK RETINA, WHO SHOULD IPROCEED? ALSO USE THE NEW APPLE ID AND IT GOES AUTOMATICALLY? DO I THEN HAVE TO AUTHORIZE THE MACBOOK RETINA WITH 1 OF THE 5 AUTHORISATIONS WHICH ARE MADE AVAILABLE?
4. WILL THE PREVIOUS MUSIC STAY IN MY IPHONE/IPAD LIBRARY WHEN I CHANGE ID?
5. WHAT HAPPENS WHEN I PLUG THE IPHONE INTO MY RETINA? SHOULD I DISABLE MUSIC SYNC/ICLOUD MUSIC SYNC BECAUSE IT GETS THE MUSIC THROUGH THE NEW APPLE ID AUTOMATIC DOWNLOAD/ MUSIC MATCH?
6. CAN I RESIGN THE MUSIC MATCH FOR THE ICLOUD APPLE ID?

Thank you all for your help in sharing experiences