I use to shoot on my 12-24. 17 or 19mm with dxeffect. Well wide enough, you dont want any lens that is distorted.
Set apeture priority at 11, nice solid tripod. make sure your horizontals are right.
point the flash at the ceiling and bracket 3 shots either side usually 1/2 stop steps with possibly a 3 stop one inorder to get skys outside windows nice and blue.
If there are objects against the window do a shot on exposure, with the flash directly toward the window.
Shoot with lamps on and off, so they can be on without casting a light on the walls.
Dont forget the self timer- it will get you out of trouble when you cant get yourself out of reflections.

Look through a Mcgrath catalogue, the photos look weird, oversturated colours and blue skys with bright interiors.
If you are shooting proffesionally, you wont have to do the post. There is a team of retouchers to do it, they usually give you good feedback on your shots too.
As for perspective correction, thats is usually all in post too, there is little time for it on the job. You have usually spent all your time moving furniture for the interiors.
enjoy!