I want to use my internal microphone to record my voice reading word doc

open garageband, select new project, click on any track (piano,etc,) when the window opens, drop down track and delete the track that is there. Then drop down track and select basic track

go to system prefs>soundselect input, select internal mic, and use the slider for level control.

go to out put and check mute to keep from feeding back.

unclick output mute to lisyen to platback

youcan then burn to disc under share, or send it to Itunes, and burn a disc or put it on a flashdrive

it should, just don't set the level too high, there is a meter on the left of the track, keep it out of the red

If your needs are basic, which it sounds like they are, then Garageband is a bit of an overkill - especially if you're not familiar with it and the way it works. A simpler solution would be to use QuickTime Player. Open it from Applications then click on 'File' -> 'New Audio Recording'. Once recorded you then have the option to trim silence from the beginning and end before you save. For more advanced editing consider Audacity - it's a free download!