systeMacs can help you get started with GarageBand. Garageband is the best way to record
Pod Casts and with iWeb integration, you can get your voice on the Internet in minutes.

GarageBand includes a few features that function like your own personal podcast radio engineer, so you can create podcasts that make you sound like a professional host. A built-in Speech Enhancer optimizes sound for your Mac, gender, and vocal range, improving the sound of your voice and simulating a professional microphone, even when you’re not using one.

You can get a tutorial on GarageaBand here.