Building a home server

I want to build a home server to store personal pictures and videos. I may want to store movies and files in the future too. The goal is to dont use alot of power, and have the server in a smaller form factor. The problem is that i dont know where to start.

I have some components laying around. An Intel I7 8700, GTX 1070, ATX 650W PSU, 2x8GB DDR4 ram, ASUS TUF B360-Pro GAMING, Kingston A1000 480GB SSD, Intel Optane 32GB, one 2TB HDD, and three 1TB HDD.

Im willing to sell and buy new/used components.

Does anybody have some tips where to start. Thanks!