NAC is short for N-Acetyl Cysteine:
https://www.healthline.com/nutrition/nac-benefits
Good for the liver and heart, you need liver support when you are taking ORAL's, I like NAC the best because it's got all sorts of bonus health stuff tied to it.
You can live without the hCG, but if you go the PCT route without hCG I really recommend getting that enclomiphene, even if you need to find another vendor. If you go the blast and cruise route you can get on it later when that's accessible for you, or you can get some before you choose to stop cruising, will help there too.
The Cruise in Blasting and Cruising is supposed to be a time of rest and recovery for the body. Some people cruise as low as 100mg Test, some guys cruise closer to 250mg, and I've seen some guys on this forum claim to be cruising on 500mg's, some of which was Tren, so it's whatever you're crazy enough to do I guess hahahaha
I feel the best around 225mg of Test, and my bloodwork looks good there. I'm still experimenting with other compounds and dosages, but I feel like that's what I can get away with and I get blood work done regularly, if something does wrong I'll just dial it back. Going on cruise is a big commitment though, you might not be able to get off so easily, guy on Youtube called Vigerous Steve came off 8 years of continuous blasting and cruising recently, documented the whole thing, bloodwork and all, so.... anything is possible, but it might not be easy.