In order to get an idea to the voting stage you must have the following:
1. The idea must be balanced and well thought out. If you haven't explored the positives and negatives, and looked at ways in which the idea could be exploited it isn't going to make it to a vote.
2. The idea must not require excessive admin interaction to prevent cheating. For example, lets say your idea is to allow trading of equipment between players, how do you prevent cheating without having an admin review each and every trade?
3. The idea must not change the concept behind the game.
If your just going to throw ideas out, without thinking through the ramifications, then don't expect to ever see the idea make it to the voting stage. If you have questions about an Idea contact Gem or myself, we can explain why an idea isn't going through yet, which will allow you to rectify it.
As to what happens after the idea is submitted... It may still not get implemented, most ideas won't be.
Some reasons you may never see the idea impilmented:
1. Too expensive to implement.
2. The idea may require too great of a code change for too little gain.
3. The idea may be prioritized so far down the ladder that it just won't make the cut.
4. The idea may conflict with future changes and be discarded.
5. The idea may require too many resources to prevent cheating.
Remember that even if its a good idea, if it doesn't fit with the final vision for the game, its not going to be implemented.