Welcome to the addiction!
You have wisely realized a few things that many people miss.
Yes, the real plane will be a little different, no matter how accurate the simulator is.
Joining a club and getting personal instruction is a wise choice. It will save you time and money by helping you avoid bad flying habits and bad choice of aircraft.
This is why you are also wise to wait and follow the advice of your instructors as to your first plane choice. Personally, I don't like the Nexstar, but if the instructors at your club do, then you would be wise to heed their advice.
You have also correctly determined that the ACT is practically useless. Turn it off.
If you follow the plan you have stated, you are destined for a positive experience in this hobby, enjoy, and keep us posted on your progress!