What I do and have done for many years is just go to the door and ask.
If they agree, I fill out a form listing the boundaries of the property, the type of hunting I will be doing, his or her address along with an exemption from liability if I am injured that is good for one year. He signs it and gets a copy, I keep the original to show game warden if asked.
Around Christmas I send a card or small gift in appreciation.
Then ask for a renew in the spring or summer.
You can have your local print shop print up permission to hunt forms with anything you want on it that will make a copy for a decent price.