It does not take much space to include a gospel presentation (how to become a Christian, what it means to be a Christian) in your church bulletin or special event handout.
This PDF contains a few examples.
Feel free to modify them in a way that would suit your church.
Though these are a good, brief summary, I strongly recommend that you also add a link to your website where you explain what it means to be a Christian in much more detail. Include links to questions about the Christian faith so people can carefully explore the Christian faith before they make the most important decision of their lives.
To download the PDF, click here or on the image.