Seeing as you could in the past games I don't see why not.
Yes
Yes you can.
Blood can be turned on or off.
I don't know abot 1 but in 2 there is no blood in cutscenes if you turn it off.
no. If you could, it wouldn't be called assassins creed 2.
Yes you can. Just go to the menu and go to options and turn off blood mode.
go to the options section in the main menu and then go to gameplay then turn blood off
yes, all you have to do is go to options and select blood and subtitles to the off button
No.
You turn them in to the basement in the Villa, your uncle will show it to you once and you will always be able to go back.
Yes. I'm not 100% sure but in Brotherhood you could.
Yes you can turn 3d on and off.