I will be listing links to sites which you may find helpful in your study and preparations.
Online study sites:
Study light : An online tool iwth Bible Dictionary, Strongs Greek Dictionary and other word study tools.
Online Bibles
The NET Bible is a translation done by several of the Dallas Theological Seminary staff. It is a very good translation. The online bible allows you to see all 67,000 translation notes. It is a great tool to assist with word studies, history of words in the Bible, etc. I highly recommend it. On the menu select Bible, online Bible.
Sermon sites to assist your study.
The following sites are from ministries that are solidly evangelical and gospel centered churches. You can find sermons and articles that will assist you in your study and preparation. All of these are available for free listening and download.
Grace to You This is the website for the teaching ministry of Dr. John MacArthur. The resources and sermon archive cover the entire New Testament and much of the OT. The Gospel of Mark is currently being taught so he is only through the first few chapters.
Desiring God This is the website of Dr. John Piper. His sermon, conference and article archives are fantastic.