Research like mad. Look at breeders, look at dogs, talk to as many Corso ppl as you can
Figure out what it is you are wanting as far as temperament goes and don't rush it. Seriously, there are a lot of good breeders out there and a few great ones IMO
My dogs are fine interacting with other dogs, I can go to the off leash. In fact last Sunday I went for a Corso walk with some friends, we had 5 CC total; 2 intact males, 2 intact females and one spayed b*tch, we had a blast. It is just staying on them and watching for any indication that a problem may arise and cut it out before it happens.
If you get a puppy, raise with your dogs you should be okay.
Just do your research.