1 – There isn’t a perfect answer to WHEN you’ll get full ROM back. Very individualized, and you just need to work at it.
2 – Same, rebuilding strength is individual. Depends on how much strength you’ve lost, how quickly things heal, swelling goes down, etc.
3 – Surgery, hard to know at this point. I believe the statistics on having a recurrent dislocation is 50-50 (and I personally would define the multiple dislocations you’ve already had as a general 1st time dislocation – others may disagree). And even if it becomes a chronic problem, doesn’t ensure surgery. You would need to make some decisions based on your tolerance of the instability, what you want your activity level to be, etc.
Overall, be patient with the rehab – this type of knee injury isn’t a black and white one where there is a clear course of action. So, it’s hard to answer your questions like you maybe want. Conservative treatment is the way to go with a first time dislocation, MRI’s aren’t necessary right off the bat (don’t really show much in regards to this injury) Let it heal up, get your ROM & strength back, and see where it's at.