Hi I'm happy to hear you are researching into this breed before getting one. I wish I did that
. You seem to have all the right reasons to become a pitbull owner.
Many of the members, including myself, are all for rescue. I understand why you are cautious. You do not get a history of temperament or medical. But it's so rewarding to know you saved a life with limited days, and you just opened up a spot for another life to be saved. With each dog being an individual, you could still come to health issues or maybe even temperament issues from a breeder and having the history. I feel rescue is very well worth it. Just with my experience with local shelters in my area, pitbulls are the second most popular (because chihuahuas are more populated) and a specific shelter has a 90% euthanasia rate for pitbulls. This is simply because they are overpopulated, and not many people will adopt them, not because they are unadoptable.
I'm glad you asked about dog aggression also because its important to be aware how susceptible this breed is to it. You should also know they tend to have high prey drives. Socialization is key. I've had my dog Bella from being a pup and once fully vaccinated, I introduced her to a mature and well mannered dog at first which i think was a good start, shes socialized well with dogs ever since. Many members on here will tell you to stay away from dog parks, I definitely agree and I would recommend reading the dog park thread. Obedience classes are good also. Socializing with dogs you feel are appropriate in a controlled area I think may be the best way. Look into body language of dogs too.