You’re going to have to do a bit of your own internet research first, and figure out what your goals are (how much data/space you plan on hoarding, how you’re going to use it, how much you’re willing to spend on hard drives, in addition to hardware, etc.) before anyone can better answer your question. You could start with something as small as a Raspberry Pi, to something as large as multiple rack mount HDD enclosures, or something kind of in between like a Synology. When you say “storing everything I possibly want,” that is extremely vague and you’re asking us to guess what you want.