I just bought a 923+ Now what?

I am a very small time photographer and tech enthusiast. I’ve gotten sick of paying out the nose for online storage and having hard drives strewn about and decided a NAS was the way to go. Because good photo software was a priority I decided to go with Synology

After much deliberation I landed on the 923+. It’s scheduled to be delivered on Friday. What do I do now? How do I pick hard drives? I’ve got $250 in the budget for the drives. Do I upgrade the RAM now or just live with what it has? Do I need to hook up a monitor to utilize the operating system? Do I need to install the DSM software?

Just have no real clue how to handle the next steps.