This is a pretty big undertaking, for a novice..................the most likely mistake you could make, is to overwet................get a helper to thoroughly vacuum , everything ahead of cleaning.
You will need assistance to get throught this in 5 - 6 hours and that's assuming the chairs respond well to an M/S or similar product.
You are very unlikely to get through this in one night, working alone, you might even struggle with two.
I would consider cleaning the seating, first and getting the carpets the next, or another, night. I f this is local, you could either, impress greatly,,,,,,,,,,,,,,,,or maybe not.
Another point, which you should be aware of, is the fact that, dark stained furniture has a nasty habit of transferring dye to wet carpets.
Just noticed the carpet size, which is pretty small and it would be daft, to leave it for another day.