Does it let you shoot missiles to or is it like just flying fighter jets around with no combats like flying commercial passenger planes in Microsoft FS?
No missiles in stock FSX. Microsoft FS is successor of FSX, though IMHO FSX is much better sim.
If you want combat, use add-ons like TACPAC or Superbug, milviz, razbam etc. Superbug is very nice but I don’t have TACPAC so I can’t tell much.
Because you want combat with IFR, I suggest checking out VRS Superbug addon or TACPAC compatible combat aircraft.
If you want peaceful flights,
You can check out high fidelity planes like PMDG. Stock planes are good for learning, though you will find them less appealing if you prefer Falcon-ish level simulations.
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