The number one suggestion I have as a new poster, especially one with a slew of suggestions is use the search feature at the top of the page. You may be able to add to an existing discussion on a topic of importance to you. This helps reduce the chatter of several "look at my ideas!" threads and presents a more cohesive message to the developers as to what the community feels strongly about and the more well reasoned points in that thread the more likely it will be implemented.

If you have your own ideas that have not yet been presented just please ensure you stay away from the CAPS LOCK and employ some semblance of proper spelling and grammar and you'll go far. Also it's a good idea to try and put yourself into the shoes of the developer, some ideas sound great on paper but in practice cause imbalance or a number of issues when implemented to millions of players. They have to find a balance to try and make as many people happy as possible, at the end of the day they are a business and cannot run off one subscriber just to make another a bit happier