Komplete Start is easily the best batch of free plug-ins you can get for Garageband. If you're willing to spend a bit of money, you can upgrade to something even better.
In this article, I explore ribbon mics, more specifically, the MXL R144 which is the best mic for beginners.
In this article, I explore what I think are the best Bluetooth headphones for music production.
In this article, I explore PianoForAll, the downloadable digital program for those of us who want to learn how to play the piano. Obviously, skills on the piano will help you as a music producer.
In this article, I explore the best set-up for recording in Garageband
The Shure SM48 is easily the best CHEAP microphone for someone who's just starting out in music production and recording.