@stam8 I’d start on YouTube, take a look at https://www.youtube.com/watch?v=72gKksBe16c. The nice thing about Synology is you get phone, chat and email support, it’s pretty good. Because you get support and specialized hardware Synology is the expensive option.
If you want something that will work and be less expensive you can use something Open Source (free!) that runs on a regular computer with attached drives. Take a look at -
TrueNAS - https://www.youtube.com/watch?v=WjLaK8yQAag
Rockstor - https://www.youtube.com/watch?v=McU8ctQFF4Y