Just go to your local electronics store and ask for
- a 330 ohm, 1/4 watt resistor for each LED (assuming you'll use red, green or yellow LEDS, this is a safe value)
- a 2n2222 or 2N3904 transistor for each "bunch" of leds that will be controlled by one pin (2N3904 is good for switching up to about eight LEDS, and 2N2222 can switch up to 30 LEDS, or even a few more)
- a 1K or 2.2K, 1/4 watt resistor for each transistor.
For what you describe, it should cost you about $2 for all of the above, without the leds.
In the central part of North America at stores called "Radio Shack", multiply the cost by seven.
Try to find a real electronics store/supplier in your town.
The circuit is Here.
The transistors above are generally emitter-base-collector if you look at them from the front, reading left to right.
hope this helps
D