Bible scholar Ben Witherington has an excellent course over at BiblicalTraining.org on New Testament Introduction. This is a 17-part audio series, with each lecture over an hour long. The course covers 5 main subject areas: 1) the history of the period in which the NT was written; 2) the social and cultural milieu in which early Christians lived; 3) the practice of the scholarly study of the NT; 4) questions of introduction about the books of the NT; and 5) the practice of exegesis and hermeneutics. Definitely worth examining, along with the other great resources provided by BiblicalTraining.org.
Check out New Testament Introduction here.