What kind of network switch do i need?

An unmanaged (aka dumb) switch just means you can't control or alter the behavior of the switch. It can't support VLAN (virtual LANs), routing, has no firewall, etc. A managed (aka smart) switch provides some or all of these features. They're rated by layer (2, 3, 4, etc.) according to just how much capability they do provide. For example, a typical layer 2 managed switch would provide VLAN support, but not IP routing. For the latter, you'd need at least a layer 3 switch, or perhaps layer 4 depending on the switch.

Jumbo frames just means that those devices are capable of creating much large “blocks” of data per message on the ethernet network than would typical be supported, thus increasing throughput. But it only works if ALL the players have jumbo frame support (all the switches and the network adapters of the two endpoints). Most ppl don’t need such capability unless you are routinely moving very large amounts of data between machines. For small, daily transactions, it’s overkill.