You uninstall the floppy drive by finding it listed in BIOS to disable, or pulling the cables off of it in case.
Yes, use the F12 menu to trigger the installer DVD or USB flash stick. Will it boot? See how far it gets in the steps to Clean Install Windows 7.
But first I'd read a bit on EFI to at least have some info on it: The 30-year-long Reign of BIOS is Over: Why UEFI W... - Input Output
Technical Note: UEFI BIOS vs. Legacy BIOS - YouTube
UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with - Windows 7 Forums
Bypass UEFI to Install WIn7