An American pitbull terrier, American bulldog , German Shepard, Rottweiler or any other dominant breed dog is alot to handle. They are not considered the right fit for novice dog owners. You sound like you have alot of time to dedicate to socialization. But be aware before you get the cute little bully pup that they are ALOT of work. I am not talking black lab pee on your carpet work. I am talking dominant dog who will take control of you if you give him the chance. When I say take control I mean is smart enough to know how to get what he wants when he wants from you. You need to establish you are the leader of the pack and or alpha male when he is a little guy so he will listen to you. If you do not he will grow to assume he is the leader and do as he pleases.That is why pits have a bad name. usually retards with no clue how to raise a dominant breed pup own them. Do not be a retard
You have to socialize him with other pups from a young age ( you will get him from the breeder at about 12-16 weeks) so he does not become prone to animal aggression. Pits can be animal aggressive. Trust me you dont want to have to break a pit fighting another pup. Unless it is another pit the other dog will most definatly lose. The biggest and most important thing is to socialize him with other dogs and animals. The second really important i task is to socialize him with people so he becomes comfortable with strangers and also people petting him, getting close to his face etc etc. Another huge thing is bordem. Most all problems arise from one of the three things I listed, You said you have alot of free time so you seem to be aware of this. Working breeds need a ton of exercise. Pits need a ton. Rain ,shine or snow. A bored dominant breed is a problem. They get desructive and jumpy. especially rotts!
If you have enough time to dedicate to the animal then there are a few things you can do to ensure you get a good pup. First off join a popular message forum for whatever breed you like. Research who is a good breeder and who is a scammer. get into the world of pitbulls. Just like there is a BB community there is also a apbt community. Research for a long time. You are going to have to wait anyway. Good breeders have waiting lists. Look up the faults of the particular breed.and if you can when you look at your pup check him out for any noticeable faults. That may not be an option as you may not have a good breeder near you. But I would try to get him or her from a breeder where you can actually look over the pup. If not just research and make certain you are buying from a reputable breeder. Especially with the pits there are alot of scammers out there since they are so popular with rappers and celebs. Pit puppies range from 500 to well over 1000. Blue pits are the most expensive. They are the perfect dogs for things like playing frisbie. They are genetics freaks. Athletic ability you have to see to believe. Same thing with American bulldogs.
If you have never owned a dog like this before be aware what you are getting. Do not buy him just because you think it is cool right now. They are a ton f work and they reward you with love and loyalty like you have never seen before. But please do not get one if you are not going to give 100 percent. He will just end up in a cage waiting to be put to sleep. Like the hundreds of other pits people buy then abandon.
A good choice for a starter dog is a miniature bull terrier. Just like its full size dad but not as much work. If you have the time to put into the pit then get him, You will not be sorry. Just make sure you do your research and raise him right!
If you need anything pm me. Good luck!