Do you want new ways to welcome members into your church? Check out these top church membership welcome letter templates and best practices.A "thank you for joining" membership letter should include a personalized greeting to the new member. Use the member's first name in your salutation. Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. Get help drafting the welcome letters to the new members of your nonprofit organization with these two useful writing templates! Here is a template for a new member welcome letter you can tailor for your own association or membershipbased organization. A good welcome letter acts as a travel guidepointing members to key resources, highlighting benefits, and outlining simple next steps. 1. Enter the date at the top of the letter. First, to begin the letter, start with a warm greeting and mention your sponsor's name.