[Gogar]

If you just want to record stuff into your computer with your microphone and the camera isn't in the picture, there is a free version of Pro Tools and all you need to do is buy the Focusrite (or something like it, there's a ton of them) and you're off to the races.

There are a million apps to record and they are all great but Pro Tools is the photoshop of audio and everyone knows it and almost everyone uses it. And there's a free one.