Here's a report from my electronics class for a bipolar device transistor.
report.pdf (1.7 MB)

Using a similar design I made an audio amplifier for my home projects.
audioamp.jpg
The gain of this amplifier may be increased by connecting a capacitor (say about 1uF or more) across the emitter resistance of the first stage. The only drawback to that is that the input impedance is duly increased.