No setup required from what I remember – it’s class compliant – but if you want to choose specific CC #s or set the behavior of the switches (momentary vs. latching), you’ll need to download the editor software called Line 6 FBV Control, which is Mac/Win only, but the settings you choose with it are permanent so they’ll apply to Norns too.
My Norns has been able to power it with no problem, looks like it draws around 150mA.