A good but brief post on apologetics can be found
here at Chris' Considerations. He briefly outlines the three types, Classical, Evidential and Presuppositional, and provides links for further study. I'm a Van Tillian Presuppositionalist myself. One's presuppositions are always the starting point. A good source on Van Til can be found at
http://www.vantil.info/. A
Prim
er on Presuppositionalism by Joel Garver is
here. Of course, in my opinion, no one else knows Van Til on this subject better than John Frame. Check out an Introduction to Presuppositional Apologetics
here and
here.