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Official Stats:
Name: Resurgent class Star Destroyer
Length: 2,915 meters
Armament: 3,000+ Turbolasers and Ion Cannons plus Tractor Beam Projectors
Hangar Capacity: 2 Wings (144) of TIE Fighters, 100 Assault Craft, 1 Legion of Stormtroopers.

Unofficial Stats (My addition):
Sublight: 60 MGLT (Same as ImpStar)
Hyperdrive: 1.0 Past Lightspeed

Armament:
20 Heavy Turbolaser Batteries (Okay in the film we see Poe and Finn take out two batteries, which according to Hux was all of their turbolasers, but probably were just the ones that could be brought to bear. So with two on the ventral side, figure probably ten on the sides, plus maybe eight up top. Keep in mind that these are probably much more powerful individual batteries then what the Impstars had, again from their looks)
800 Turbolaser Cannons (We see a lot of turbolaser fire from all around the ship where they're flying the TIE Fighter and even still while they're evading the missiles.)
100 Quad Missile Launchers (Same logic with the Turbolasers, except Hux says specifically for the Central Battery to fire, implying that there are more.)
200 Ion Cannons (Random Number to complement the Turbolasers)
20 Tractor Beam Projectors

The unofficial stats are proposed only if people want to get more technical. Personally I'm fine with just using the official stats as provided. ]