Your needs in a service dog will be unique. No other person will require exactly what you need your dog to do for you.
So it makes total sense to train your own service dog and get exactly what you need.
But no matter what else you train your dog to do, bite inhibition is crucial. For any dog, pet or service. The joy goes right out the window when a puppy or adult dog bites someone.
See this quick video showing our trainer Robin teaching Sable how to resist the urge to bite hands - I've been using this ever since to teach her all kinds of other things too, like to watch me, sit, down and even come.
It's important not to completely squelch the urge to bite, because that doesn't teach them to just bite gently.
The goal is to teach them to diminish their force, until they may just be mouthing or licking. Then later as an adult, they will know not to bite hard if the situation arises.
Find out more tips on teaching your puppy not to bite.
Lots of skills start out as fun games, like retrieving things. Balls, frisbees or just a stick can be the basis of learning how to go and get whatever the trainer wants.
Tug, using a rope, or two identical tug toys, is a great way to teach politeness, giving up the object into hands or onto the lap of the trainer.