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.Do you want new ways to welcome members into your church? Check out these top church membership welcome letter templates and best practices. Hey there, new team member! We're excited to have you join us. Here are some sample family letters to get started to welcome new troop members. As you can see, there are many different ways to run a troop. Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. Welcome to the Team Telomere Board of Directors!