A Lectionary is a schedule of selected passages from the Bible. We are more likely to read the Bible on a regular basis if we have a plan by which to do so. As always, read prayerfully, asking God to grant you wisdom, instruction and inspiration in His Holy Word.
The Revised Common Lectionary is based on a three year cycle, each year beginning on the first Sunday of the Advent Season.
Here are links to the Vanderbilt School of Divinity lectionary listings for each year.