You don't. Training to have sex is abuse. This is a puppy and until the dog is around 2 years old, nothing should be even considered let alone go near the animal's genitals. The sole purpose of a dog is non sexual companionship. sex is a mere bonus, but if your purchased this puppy with the sole idea to have sex with it, get rid of the dog right now.
You will raise this dog like any one else, house train it, teach it manners and obedience, feed it a proper dog food balanced diet, get it the vet care it needs, and walk the dog daily. Once the dog is 18 months old, then perhaps consider experimenting but if the dog rejects your advances, by growling pulling away, running away, cowering, panting, whimpering or anything of the sort, the dog gave you its answer. NO. and it must be respected. You will not be able to go further and must give up on the idea of having sex with the animal. if the possibility of not being able to have sex with the dog sounds disappointing to you, again, get rid of the dog now.