some useful sites on BJT emitter and emitter follower circuit design

follow the links, this should teach you how to build a functional emitter amplifier circuit, the most basic transistor circuit there is that is in common use.

http://www.experimentalistsanonymous.com/ve3wwg/doku.php?id=design_transistor_stage


http://www.experimentalistsanonymous.com/ve3wwg/doku.php?id=ss_circuit_engineering


http://www.radio-electronics.com/info/circuits/transistor/common-emitter-amplifier-design.php


and some stuff on emitter follower design:

http://www.experimentalistsanonymous.com/ve3wwg/doku.php?id=design_emitter_follower


http://www.experimentalistsanonymous.com/ve3wwg/doku.php?id=design_emitter_follower

common base design:

http://en.transistoramp.de/common-base-circuit/