Your first step you've already taken by registering and posting on this forum. Your next step, depending how much time you have, is to read the many threads on this forum and then other useful forums like RC Groups Inspire thread.
The only way you can get any practice on the Inspire simulator is to have the craft in hand, as it will not work without the controller and craft connected.
That's expensive and not necessary, if all you want to do is figure out how to control multi-rotors. Your private pilot experience will give you the necessary background for airspace rules and safety guidance.
So get a Blade Nano qx, which you can fly around the house and bounce off the walls without too much damage, or outside, if there is little to no wind, since it is so tiny. You'll figure out how difficult it is to control the craft when it's facing you, since control inputs have to be reversed.
When you've figured the nano qx out, the Inspire, or as an intermediate step, the Phantom 2 or Phantom Vision+, will be so much easier to control, since their stability with GPS is much greater. But their complexity increases as well, so your mind has to go from simple craft control to adding camera control into the mix. This is where it gets more difficult because craft control requires that practiced eye-hand coordination without having to think it out first.
The Inspire is an incredibly capable machine, but it's not for beginners, no matter what DJI marketing would have you believe. I'm a pilot who started out like you, without previous RC experience. My first MR was the Phantom 1, and I was humbled a few times. It's nothing like flying a real aircraft. I've crashed one beyond repair and sunk another one (Phantom 2) in the Everglades trying to get a little too fancy with my flying. So get something you can afford to lose first. When you feel you're ready, then move up to the inspire.