Just buy what you need and keep including till you have the proper setup. Each case is totally different, and the number of supported followers, cutouts, and drive bays varies by case. Pick one with good airflow and room for upgrades, and find out if your parts will match comfortably. The beauty of storage is you could all the time improve in the future, so lengthy as you buy a decent motherboard. My motherboard, an ASUS Prime X470-Pro, has 6 SATA ports for HDDs or SATA SSDs, and it also has two M.2 sockets for NVMe SSDs.