Where do I start with a Vero 4K+ (not older Vero 4K)?

Hello and welcome to the forums.

Firstly, the Vero 4K is very similar to the Vero 4K +. Instructions for either device will work.

Your best bets would be:

https://kodi.wiki/view/Quick_start_guide

and File sharing with a NAS, media server, windows share or other device

There is only a red LED, displayed when booting or if the device is in standby.

It sounds like you haven’t plugged the USB remote receiver in. If you wish to use the supplied remote control, you’ll need to plug that in. It is a small receiver and would have arrived taped to the back of the PE bag which your remote control arrived in. Once this is plugged in, the remote should then work as expected.

The pairing procedure applies to all generation of OSMC remotes, but obviously needs the USB plugged in.

Cheers

Sam