Urgent! Questions/Confirmations concerning *Debian 7.7.0 amd64* before I install it.

Dear All

My name is Quek from Malaysia. I am now downloading Debian 7.7.0 amd64.

Right now my workstation uses w****** 7 ultimate 64bit, with one(1) CPU (Core i7-4770K), and 32GB of RAM.

I need your help!
Before I decide to install it for my upcoming "compute-server" and possibly even my current workstation, I need to confirm with ALL the following:
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1. According to: https://www.debian.org/ports/amd64/
    It appears to me that Debian 7.7.0 amd64 supports up to 64TB of RAM, which is much more than even the 192GB limit for    w******. -------- Kindly confirm.

2. According to: https://www.gnu.org/philosophy/ubuntu-spyware.html
    It appears to me that some GNU OS has this annoying problem, how about Debian 7.7.0 amd64?

3. According to: https://www.gnu.org/distros/common-distros.html

    It appears to me than some of the features in the firmware/repository are not free. Therefore, during installation of Debian 7.7.0 amd64,
         a. "the installer in some cases recommends these nonfree firmware files for the peripherals on the machine."
              Will I be given the choice not to install those nonfree features?
         b.  If I do so,   i.  Will it affect the performance of the OS?

                             ii. Will the maximum supporting RAM remains 64TB?
                      
                            iii.  Will I still benefit from ALL advantages amd64 offers, as stated in "A complete 64bit userland" of
                                 site https://www.debian.org/ports/amd64/?


4. According to http://cdimage.debian.org/debian-cd/7.7.0/amd64/iso-dvd/ ,
    There are 5 isos (which I am downloading)
    "Debian-7.7.0-amd64-DVD-1.iso            2014-10-18 15:39  3.7G  "
    "Debian-7.7.0-amd64-DVD-2.iso            2014-10-18 15:39  4.4G  "
    "Debian-7.7.0-amd64-DVD-3.iso            2014-10-18 15:39  4.4G  "
    "Debian-update-7.7.0-amd64-DVD-1.iso 2014-10-19 02:16  4.2G  "
    "Debian-update-7.7.0-amd64-DVD-2.iso 2014-10-19 02:19  1.6G  "
     Which of them is/are mandatory for installation of Debian 7.7.0 amd64?
    (Note: Please do NOT direct me to the net-installer! I need a robust DVD file than enables me to install it offline! Moreover,
     this compute-server may not be connected to the internet)

5. Some Server OS (such as w****** server standard), supports only few (e.g. less than 4) CPUs.
    Some others (such as w****** server datacenter), supports "infinite" CPUs.
    So how about Debian 7.7.0 amd64?

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Hope to hear from you soon.

Regards

Quek