[q] moto g without an os after twrp recovery topic

Sorry if I'm doing something wrong here, I've just made an account now because I'm in need of drastic help. I was trying to install CyanogenMod on my Moto G 1st generation. While it was on its first boot, it froze or something, so I did what the internet suggested and did a reset for everything. Then, obviously, when I tried to install CM12 again, I couldn't because it wasn't on the internal storage, and neither was the stock OS. So now all I can do is just sort of.. be on TWRP Recovery. I'm really worried about this, and all googling the question did was confuse me, so please, please, please can someone sum up what I need to do with links, just to either get CM12 back on internal storage, or recover stock. Thank you!