1. No, most of Black Ops 2 Modding requires a modified console.
2. E3 Flasher is needed to downgrade, ( if your console is compatible with the E3) Once downgraded, you can install CFW.
3. Yes, once you spoof to the latest update you'll be able to connect to PSN and play online.
4. There's a shit ton. Modding wise, check
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5. It won't last for modding in my opinion. I'd buy a separate HDD just in case.
6. Play normally.
7. Modify games, torrent games, use pkg files, and delve into developer features of the console.
8. DVARs are part of the game code which can be manipulated into tools and menu's.
9. a JTAG is basically the Xbox's Jailbreak.
10. TU18 is an Xbox Modding Term that represents the version/type of program you're using.
11. GSC is direct script from the game, it's used to create Mod Menu's and other things that can be done via script.
12. Macs are ok, but they aren't allowed access to certain programs that Windows can use. This is being improved as time permits though.