<p>As @Scortchi said:</p>

<blockquote>
  <p>The most important thing is making your question clear &amp; interesting to as many users as you can. Pay especial attention to the title &amp; to selecting a variety of relevant tags.</p>
</blockquote>

<p>We have a <a href="/questions/tagged/faq" class="post-tag moderator-tag" title="show questions tagged &#39;faq&#39;" rel="tag">faq</a> post specifically written to help users asking clear and  good questions:</p>

<p><a href="https://stats.meta.stackexchange.com/questions/1479/how-to-ask-a-good-question-on-crossvalidated">How to ask a &quot;good&quot; question on CrossValidated?</a></p>

<p>@whuber still provides further guidance:</p>

<blockquote>
  <p>...one should attempt to ask a question as briefly as possible. I suspect that any time a question exceeds one page, it will lose a majority of potential readers unless it is so engagingly asked and illustrated that people really enjoy reading through it. Even if one feel that offering many details is necessary, ask a question at the outset so that people know what it's about, whether they are interested in it, and whether they might be able to answer.</p>
</blockquote>

<p>Another reference to read (from the main Meta Stack Exchange) is: <a href="https://meta.stackexchange.com/questions/8010/how-can-i-get-answers-fast">How can I get answers fast?</a>, which is in accordance to what was already said here. An extra point I'd like to emphasize from there is:</p>

<blockquote>
  <ul>
  <li>Keep refining/editing your questions until they are perfect.</li>
  </ul>
</blockquote>

<p>specially if someone leaves a comment asking for clarifications; respond to it as fast as you can (i.e., not only respond in the comments, but edit the question to clarify it too).</p>
