- Configure my existing portable install of MC to auto import from the server.
- Copy the portable install to all PCs except the server.
This means that all clients will have to perform imports themselves and, if there is any metadata that cannot be stored in the actual files, manual tweaking to the tags may have to be done on each PC. Your data might be perfectly fine though and it will therefore all run without intervention.
An alternative is to regularly make backups of the library (using the built-in function) and then copy the backup to the clients and restore them. This will not only replicate the entire library but also all your view schemes, so that if you decide to make a change then you don't need to reinstall the whole thing or make changes manually.
I'm not saying which is the best method for you, just an alternative idea for you to think about,
I don't want a screen on my server so can i use a some kind of remote desktop to start/check it?
Yes, you can use the Windows RDP if you have a Pro version of Windows on the server. Or you could investigate a VNC application or something like Splashtop.
I have an Android mp3 player that I want to use as a remote. Can it be used on any of my PC's or just one? Is this what gizmo is for?
Gizmo is J River's own Android remote control for MC, although I believe it has been surpassed by the iOS third party app JRemote and needs some more development, and there are others too. All these remote controls will allow you to connect to any MC library server and push media to any MC client, alternatively connect to any client and pull media from any server.