Whether you hope to go on outdoor adventure with your dog, are worried about your dog escaping out your front door, or just do not want to have to chase your dog down every time that you need him to come over to you, 'come' is one of the most important commands that you can teach your dog. 'Come' could one day save his life, and you never know when you might need it.
At the same time though, your dog should not come to you only when he feels like it. He does need to learn that coming is not optional, it is something important that he has to do. That is why it is important to reel him in with a long leash or go get him and bring him back to where you called him from if he chooses to ignore your command. He needs to learn that the quickest way to get back to what he was doing before is to come to you first. For that reason, after you call him to you, as much as possible, allow him to return to what he was previously doing after he comes.
There will be times when your dog will need to come to you for something unpleasant and will not be able to return to what he was doing before. If he was chasing a car, then he obviously needs to leave the car alone, which is unpleasant for him, and he cannot return to the car after he comes. When you must call him to you to do something unpleasant to him and you cannot allow him to return to what he was doing before, then practice 'come' several times in a row after that incident, and reward him when he comes each of those times, and then allow him to go back to what he was doing before each time, so that he will still expect coming to be pleasant in the future.
If you are using 'The Hide And Seek Method' then your calm location will need to have simple hiding places, such as trees, furniture, or walls. If you are using 'The Round Robin Method' or 'The Long Leash Method' then your calm location will need to be spacious. For all of the methods, you will also need additional locations with different types of distractions, to practice your training in as your dog improves.
If you are using 'The Long Leash Method' then you will also need a padded back clip harness and a thirty or fifty-foot leash. You also might need a padded back clip harness and a thirty or fifty-foot leash if you are using 'The Round Robin Method' or 'The Hide And Seek Method' and anywhere that you practice the training that is not safely enclosed. If you are using 'The Round Robin Method' or 'The Hide And Seek Method' then you will need at least one assistant. If you are using 'The Hide And Seek Method', you can still practice this method without the help of an assistant, but instead of having the assistant call your dog and hide after you release him, you can simply wait until your dog wanders away from you after you release him, before calling him to yourself and a new hiding place again. This will take more time, but it can be done.
With all of the methods, you will need a positive and upbeat attitude, patience, persistence, and a willingness to have fun with your dog while training!