We recommend the F-260 Bible reading plan, which covers the entire meta-narrative of scripture through 5 weekly readings (with weekends off). You can download a PDF of the plan here, and purchase the Foundations journal for additional (optional) resources.
We also recommend the NT-260 Bible reading plan, which goes through the 27 books of the New Testament through 5 weekly readings. You can find more information and download the PDF here.
You can also find dozens of additional reading plans through YouVersion's Bible App.
Download the MARCS Assessment to help the participants in your D-Group gauge their own spiritual growth as well as determine where they are as a disciplemaker.
To learn more about getting involved or starting your own D-Group, download the D-Group Overview.