On one hand, maybe you don't want to start with CVT's works. He is not exactly...readable, aphorist though he may be.
That being said, Bahnse's book on him, while being so awesome, is likewise overwhelming.
I would start with Van Til's book on Doctrine of Scripture.
The best intro to CVT is John Frame's book on him. I am about to start my third reading of it.
Amazon.com: Cornelius Van Til: An Analysis of His Thought: John M. Frame,Cornelius Van Til: Books