I bought all the parts to a pc I was going to build, but the order to my hard disk drive was canceled. I think that's what it's called at least. It's whatever determines the storage. Here is the build. https://pcpartpicker.com/list/82fKsh
you already have a drive, the 2tb m.2 one.
If you need more, get whatever size hard drive you need and can afford.
Skyhawk series in nice value for money