First time Zima Blade questions

Hey y'all I'm excited to pick up my zima blade from the mail tomorrow and to start tinkering with it this is my first time doing something like this!

I have a few questions and would appreciate some feedback or advice.

1: from my understanding Casa OS is dead so it's recommended that I flash Zima OS on to it right away.

2: the prices of HDDs are kinda crazy currently is it fine if I only get one 8tb now and then another one in the future when the price is more reasonable? I know that means I won't have RAID and I risk losing everything if the drive fails.

3: Do I get the specialised HDD for NAS or just the regular one if there is a huge difference that I will experience for my project?

Both are the same price by me what is recommended for a first time build?

Seagate Barracuda HDD 8TB SATA 3

Or

Seagate IronWolf Nas 4TB SATA 3

Thanks 🙏🏻