The following books are standard works on the Monastic life and are readily available from most bookshops.

1.   The Cistercian Way  Andre Louf OCSO

2.   On being a Contemplative  - Ignatius de Pont 
3.   Seeking God.  - Esther de Waal
4.   The Cistercians: The Way of Simplicity - Esther de Waal
5.   The Rule of St Benedict      Many translations available.
6.   Living with Contradiction - Esther de Waal
7.   Searching for God - Basil Hume OSB
8.   The Rule of St Benedict 
       Insights for the ages - Joan Chittister
9.   The Path of Life - Cyprian Smith OSB
10. The Call of Silent Love DLT - Carthusian Novice Series

On prayer  the following may be useful:

1.   Beginning to Pray - Anthony Bloom
2.   Meditations on a theme - Anthony Bloom
3.   Towards God - Michael Casey OCSO 
4.   Prayer  Vols 1 & 2 - Simon Tugwell OP
5.   How to Pray - Andre Louf OCSO 
6.   Personal Prayer According 
       to the Monastic Tradition - Columban Heaney OCSO

The Bible  

The basis of all prayer is Scripture.  There are many daily guides to Bible Study available.  Barclay's Daily Bible Study or
6 Weeks with the Bible series by Loyola Press are both recommended for those unfamiliar with praying the scriptures.