The Trinity is a great doctrine which evangelicals would do well to spend more energy on (including myself). As an encouragement for you, the following link will take you to an hour-long discussion on the history of Trinitarian thought, hosted by Reformed Forum. The dialogue includes Dr. Carl Trueman, Professor of Historical Theology and Church History at Westminster Seminary. This is an academic introduction so is a bit of heavy lifting at times.
A description of the program and the audio can be found here. Or you can jump directly to the audio file by clicking here.