I'm no expert on shows and confirmation, as I am just getting interested in showing and don't have me a show dog yet (I'm looking at you Rhoadie! Almost time to get to stepping young buck!) but I'll tell you what I do know. You need to start by researching and getting your pup UKC or ADBA registered. They are the only clubs that recognize AmBullys. I would recommend UKC especially since your sore is already 'PR
' recognized and registered there. UKC, from my understanding, is also much friendlier to newbies. You want to become very familiar with their standards. Confirmation showings are judging your dog by the breed standards. I'm very unfamiliar with the Bully standards as my interest lies more with ABPTs but everything is available online. You want to learn the anatomy of dogs and how your dog will be judged. While you're researching that start with obedience. Regardless of what avenue you take your dog needs to have his basic obedience mastered to be successful. The Canine Good Citizen program is a great place to start and emphasizes basic obedience and behavior principles.
Once you have those basics down, I can't be of much help as of yet. I know Indy on here is into the show circuit and can be of more help. She's been a little AWOL lately but she just moved so she's got a good excuse. If you send her a PM she'll know you're looking for her and get back to you when she can. She's won quite a bit with Indy and is earning ribbons left and right with Indy's litter. She's also into more than just confirmation as she does dock jumping and dabbled in some other sporting events. She's been a huge help to me and I got to meet her and some of her amazing dogs at a show as she's not too far from me. I'm sure there's others here that can offer some insight or info that I'm unaware of or not as friendly with yet. I just got hooked up with Indy since she's relatively close location wise!
You can also try to head to some UKC shows that may be close enough to see. Dog people are ALWAYS willing to talk about their dogs and are very friendly. They can help steer you further and give you some insight!
I hope that's helpful as well, like I said I've just started studying and learning the ins and outs of the show ring and official dog sports. I can train em but I've never competed or shown a dog.