What devotion material should I use?

There are heaps of devotional material out there. The best rule of thumb is, the older the better.

When looking at devotion, remember that devotion is only a declaration of dependence, not a demonstration of discipline. Be flexible with your Quiet time and treat it as meeting God like you would a good friend or boyfriend/girlfriend. ENJOY your time with God and if you don't, ask God for help to enjoy your quiet time. Do you think He will answer such a prayer? Of course! That's why you exist - to glorify God and enjoy him forever!

Streams in the Desert for each month of the year
http://www.fourteenfloor.com/2006/11/22/streams-in-the-desert-mobile-devotion

Our Daily Bread Online
http://www.rbc.org/odb/odb.shtml

Spurgeon's Faith's check book

http://www.spurgeon.org/fcb/fcb.cgi

Spurgeon's Morning Devotion for Today

http://www.spurgeon.org/morn_eve/this_morning.cgi

Spurgeon's Evening Devotion for Today

http://www.spurgeon.org/morn_eve/this_evening.cgi

God Calling 

http://www.twolisteners.org/God%20Calling%20TOC.htm