Most people haven't talked about the adoption process. Every shelter is different. Some won't even consider you without prior pets and want prior vet and references to confirm. Some will want you to have a fenced yard. Some may even want a house visit.

St Huberts is where I got my pup and they are much simpler. Quick form, meet dogs pay price and they will call to see how things are a few times over the next few weeks. Also their training is cheaper if you adopt from them.

Also just note that most of the shelters have pit mixes labeled as lab mix, gsd mix, etc. Pits can be great but not for everyone.

As far as training I recommend 2 books by Shay Kelly, Canine Enrichment and Dog Training and Behavior. If you are getting a puppy Canine Enrichment is a must IMO, it will give you plenty of ideas to keep your buddy busy and give you a much needed break.