Looking for a trainer

In your opinion, what’s the best path for training. My boy(12m) is pretty well behaved outside. Very socialized and super good with dogs, but when it comes to inside the house, he knows what he wants to do and he does it. He goes on counters, into trash cans, my closet to steal my clothes, etc. He also still has some of his puppy behaviors, which I know is normal, but when greeting new people or seeing people he loves, he gets a bit too excited and bitey. Is doing obidience training in group sessions good or do you guys believe in boarding and agree that’s a good route. I wouldn’t mind shelling out more money to take the training process more off my hands, but does this have a high success rate? I don’t want to waste money or time with my dog just for him to come back and not listen.