I'll fill you in on the first part of training your dog to be a guard dog. Is this a puppy?
Socialize every single day. Take her someplace new, new ground surfaces, new people, crowds, small numbers of people, all kinds of people, big, little, wearing hats, men, women, using umbrellas, running, walking, dogs, puppies, machinery, traffic, the vet office for a social call and a treat, have people come to your house and give her treats and play with her. Get together with friends with friendly pups. Go in an elevator or along the city sidewalk. Let people stop and pet her and give her treats. Be friendly yourself to people. Enroll her in obedience class using positive method trianing. Condition her gently to anything and everything you will ever want to do with her; nail clipping, ear cleaning, teeth brushing, other grooming, let strangers (friends first) open her mouth and examine her teeth and go all over her body with their hands. Let people pat her on top of her head gently and give treats. Teach her her basic obedience commands and be gentle and rewarding, never punishing. Show her what you want, re-direct or distract from behaviors you don't want and praise/treat her for wanted behaviors.
When she is absolutely comfortable and confident, not shy one bit with all of the above, you will have a dog who knows the difference between the good guys and the bad guys. When the abnormal occurs, she will alert you and let them know that they need to back off, if she has it in her temperament. If not, you wouldn't have had a guard or protection dog anyhow. You'd have a nice, friendly dog who's a good ambassador to the breed. God knows, they can use some.
If you don't socialize and train the dog amply, you may well end up with a thug, not a guard or protection dog.
(most dogs have some protection instincts, just because they're pack animals)