1.Assuming you have a legitimate win 10 pro key,you have to create a file named ei.cfg & put it inside "sources" folder of win 10 boot media.Open notepad & type the following lines:
[EditionID]
Professional
[Channel]
Retail
[VL]
0
Then save the file as ei.cfg(remember to change the save as file option to "all files" from "text document files" in the save as dialogue window so notepad does not automatically add .txt to file name).
2.You can't unless you are willing to run various tools almost every month.In win 10 there is no official way to disable automatic updates when connected to internet via lan.You can use this tool created by shewolf of MDL:
wumt.zip - Google Driv
3.According to this,Yes:
*www.keynotesupport.com/windows/microsoft-windows-office-compatibility-chart.shtml
4.Installing Windows 7 on UEFI based computer | Ask the Core Tea