I would recommend trying out Reaper, which is much more powerful than Garageband, and it allows much better sound quality than just CD quality (16 Bit, 44.1 kHz), which is a must for serious recording.
A huge advantage of Reaper compared to other powerful DAWs is, that you can start using it for free and in case you like it, it only costs 60 bucks. Furthermore it‘s much easier to learn than other DAWs, because it has the most powerful community of all (forum and tutorial videos besides free manual).
www.reaper.fmThe only downside of Reaper is, that it has no instruments included, but hey, that‘s why it‘s so cheap. But in the forum you will find tips for free instruments (VSTi) and some of them are pretty damn good.