1. You can use the resistor calculator to find that out.
http://led.linear1.org/1led.wiz
2. The av switches have 4 prongs, 2 for the switch and 2 for the led.
The led is marked with a positive and negative, and will be wired to the board using the same diagram as an indicator led in the nano biscotti manual. You will need a resistor for the led, which you can find the specs for in the product description of the part itself.
3. Wiring diagrams from the manual are going to be the best bet, if you're confused by something in particular, point it out (with a visual reference) and we can help tell you what it means. Otherwise we would potentially confusing you further.
4. Yes. They come back in stock regularly.
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