Alright
Main room and one other it should be fine for.
Plenty of power in that receiver then.
3 rooms I don't know.
It only has Component so anything that requires HDCP is out. Also it has limited inputs:

Mine:

If you are looking to keep it for a while get as many inputs as you can.
Speakers we will deal with later.
HDMI in and out for future proofing would be best.