I have solid experience configuring and maintaining Linux, but my knowledge in networking is quite basic. What should my first configurations and preparations should I do before flashing Openwrt and setting it up for my home network?
PS. If I can use the switch as a NAS, I’d be delighted.
Read. For example the tutorials in the openwrt wiki. I found them quite helpful.
Nothing… except the exact prerequisites for the flashing itself.
Your network config comes afterwards.