By implementing these strategies and tailoring the invitation to your specific needs, your church can create powerful invitations that resonate. All you have to do is add your church's information, why you'd like the letter recipient to join, and contact information in case they have any questions.Use an appropriate tone. The letter should include specific details like your relationship with the visitor, the purpose of their visit, duration of stay, and financial arrangements. Complete the Invitation Letter form. How to Write Invitation Letter Heading. A good church invitation letter should be warm, welcoming, and to the point. Legal status in the host country (e.g. , citizen, permanent resident, work visa, student visa, etc.) Signature. The city and state should always be written out in full.