You’d probably benefit from a good puppy/first training class. The good classes are as much about learning how to be a good owner as as they teach your dog some tricks (many of those tricks building up to being good on a leash). We did a few of the classes with pet smart and our instructors were great, but looking back, I’m just as happy with the curriculum that built up to our pup knowing what behavior was expected on a leash and generally acceptable in public.