Romans 6:17 "But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you." Do you know any Doctrine? If not this has got to be one of the greatest resources for gaining knowledge and wisdom. It is the sermon series called "Doctrine" from Pastor Mark Driscoll and Mars Hill Church.
Whether or not you agree with Driscoll's use of colorful language this is a great presentation of some of the foundational Christian Doctrines. Doctrines include, The Trinity, Creation, Revelation, The Fall, Incarnation, Covenants, Incarnation, The Cross, and more
This Series will help you gain a firmer foundation, allow you to grow closer to the Lord, and equip you in your evangelism. I actually will be giving an audio copy of "The Cross" sermon to those who seem interested or actually receive Christ.
You can find the Videos streaming or on iTunes. They are all very good and very entertaining. I especially enjoyed The Cross it was amazing.