How do I install Windows 8.1 so that I can later dual boot with Ubuntu?

I have 2 more questions.

Ubuntu Live DVD doesn't boot in Legacy mode.
For Dual Booting do I need to install both os in same mode (Legacy/UEFI)?



Ubuntu Live DVD doesn't boot in Legacy mode.
For Dual Booting do I need to install both os in same mode (Legacy/UEFI)?


Ubuntu Live DVD doesn't boot in Legacy mode.
For Dual Booting do I need to install both os in same mode (Legacy/UEFI)? I think this is related to main question.

Many Thanks.