Hi Davey,
...and welcome.
When you say protection, do you mean from water/mud/grime from the road?...or protection of vulnerable parts?
Muck-wise, most will recommend a Mudsling...available from Nippy Normans, on the banner above....this is a shroud for the area above the back wheel. I've got one, as have many, and I think they are great, but expensive.
I also think fitting side panels to the side framework makes a huge difference...these are again available from Nippy Normans, or direct from Wunderlich, or Touratech, depending on which design you prefer.
As for protecting vulnerable equipment...there are hundreds of options available, that protect near enough everything...how much is necessary, and how much is bling, is down to personal choice.
Personally I think a little tinkering is ok.
Now you've bought a BMW, you will soon be aware of Wunderlich, Touratech, and Nippy Normans, as you personalise your bike, and you'll soon be getting the catologues, and the parts that follow!
Hope that helped.
Ride safe.