Just me, but watch
Scott Hargis's lynda.com course on real estate photography. One of my public library systems offers free access to lynda.com. You might also have access through work or school.
Hargis walks you through entire shoots where he only uses 1 to 3 speedlights on travel tripods for speed of setup and movement. One simple setup is to simply use the plastic foot that comes with the flash, balance it on top of a door and bounce it into the corner of the room. You don't need a super fancy off-camera setup with studio strobes to do this but some light stands, swivels and umbrellas might not go amiss.
In the videos, Hargis uses old Nikon SB-26s and dumb optical slave mode, but I'd recommend getting two or three
$60 Godox TT600 speedlights and an X2T-P ($60), Xpro-P or Flashpoint R2 Pro II-P ($70) transmitter, so you can use more reliable radio and have remote M power and group on/off control as well as HSS capability.
Don't go Yongnuo. There's no expansion path there, and the YN585EX requires add-on triggers to be used over radio which is one more thing to have to remember to haul with you, and one more link in the setup chain. Built-in radio is much more convenient. And over a cheap YN-560IV/YN-560-TX Yongnuo setup, the Godox setup will let you add in studio strobes, and TTL speedlights (TT350-P, V1-P), and has cross-brand TTL support if you shoot more than one brand of camera.