I recently got into VR and the spotting is not too much of a problem in my opinion, really just like on the monitor, you need to be alert and scan your surroundings. Takes some time to get used to I guess. As for dogfights, try to stay focused on following the enemy aircraft and not so much on flying the aircraft. This may sound weird, but if you got some sim experience, just keep your eyes on the enemy plane and subconsciously you'll fly your plane towards this one enemy. At least, that works for me, I find that following enemy aircraft in VR feels very natural as you're much more immersed and the depth perception is great.
I once heard someone say that you should focus on keeping the sights on the target when firing at a target with a gun, don't focus on controlling the recoil: that will happen by itself if you keep the target in your sights. I think that kinda applies here too