It is often tempting to compress information into a letter. Pressures of space might mean that there are challenges to include whatever. As well as ensuring your church is able to pay the bills (giving to need) it is important to include a discipleship element of giving (needing to give). Using a booklet enables you to cover both.
Below are links to template booklets that just need your parish name placing on them – and perhaps illustrated by a picture of the Church or, if you are a benefice, a benefice logo. The headings and titles indicate what they are. They have all been produced for actual parishes as part of planned giving reviews. As they are Word documents, you can cut and paste as you wish to tailor them to your own parish.