Basically, as the title states my brother got a dog a couple months ago from a family member because the dog was "impossible" for them to train. I assume he was abused when he was younger because of how skidish he is.
He likes women in particular; my brother's wife is his safe space. She did not do anything different than my brother it is as simple as he loves women and dislikes men (this has been confirmed with him being more comfortable with brand new women over known males). The reason the question of training is being asked now is because he has just now actually started letting men walk up to him if my sister-in-law in around.
Just how would you suggest going about training him, he needs to be kennel, leash and overall obedience trained; he is already potty trained and understand a lot of stuff a younger dog than him should know. Also, any notes on how to train out gun shyness, he is terrified of any firearm; we have a few law enforcement friends and when they are around, he refuses to be near them and have narrowed it down to gun shyness. Between hunting and law enforcement family and friends it is best to train this out of him the best we can.
Note: He isn't aggressive in any way towards people or other animals, he is only shy and does not want to be around anyone other than those he's already vetted.