Maybe I'm biting off more than I can chew. I don't know what the difference between managed and unmanaged is, so I probably won't notice or use the benefits.
Which tells me you need unmanaged. Networking can get confusing quite quickly and is easy to cock up.
Basically, an unmanaged switch is just like a fancy, powered extension lead - you plug it in, power it and then plug other things into it. Job done, no config needed at all, it will just switch packets all day between the things that are connected to it.
A managed switch needs config. It needs its own IP address, you need to tell it what to switch and where (and what not to switch, one of its main uses) and you can do all sorts of fancy things like segmenting networks and it'll usually have tons of monitoring options. Some will come in 'dumb' mode, effectively acting like an unmanaged switch until you do stuff to it, but many (inc Ubiquiti) will not and will need at least a basic setup loaded before they'll start switching packets.
Of course, for all that extra functionality, you pay more