To achieve a "good" recording or to begin building your home studio, you'll need to invest in a quality Microphone. There are MANY mics out there that can connect to just about anything. The most practical, however, is to invest in a USB mic that can connect to a computer and possibly other devices. The two usb mics that SLC recommends are:
For a list of quality mics that attach to your smartphone, check out this article by MicReviews.com.