Starting with sheer flats

Hey all! Just building my stash ahead of the arrival of my first, but fesr i made a poor investment. I have 6 newborn aio, a ton of pocket and booster insert, 24 newborn prefolds, and just acquired 38 flats.

The flats just arrived today and after talking to the seller they mentioned that they believed they were home made, which I don't mind, bit they seem incredibly sheer, almost to the point of being see through. I know I can fold them into smaller squares to used with a newborn and add my boosters and pocket inserts, but did i make a huge mistake in getting such thin flats?

I want to use flats as my primary diaper but I can't see how these wouldn't be soaked through immediately unless I double them up...should I just est the cost and buy new flats from a reliable company?