Options-What determines which are traded?

[Rdnarad@xxxxxxxxxxxxx]

If you go to the CBOE and find a list of options which can be traded,
you find quite a large list.  If you then look to see how many are
actually traded, the list is relatively small.

So my question is, if I see that options can be traded but none are how
do I make a trade and what determines if someone in the pit decides to
make a trade.

For example, let's say no options have been traded yet for a particular
stock  but I put a day order for a specific option in.  How is it
determined that it is filled or not?