>Beginners class as he is a show dog and do not want him to sit.
If you concentrate on finding a good trainer/class where they teach reward based training with kind methods and a dollop of commonsense they'll help with this too.
They won't ask you to encourage behaviours you don't want but as far as a sit goes they'll probably teach you to get
all the positions. Most dogs learn the difference between sit and stand pretty quickly anyway and
you decide when to ask for them.
I think my boy was one of the first show dogs my trainer worked with and she really enjoyed helping us with the 'show' elements, and customising exercises for us. He completed puppy foundation all the way up to KC Gold Citizens Gold, and still did everything needed in the show ring. A good
APD Trainer is worth searching for so good luck. Try and watch a class before you decide - there are a few duffers about :)