HTML5 Semantic mark up help

I'm just starting a new app. Below is a basic mockup of what I am tasked to do. I'm new to using HTML5 for my semantic markup so I'd like some feedback/help.

I'd like to understand how/where to use things like <nav> and <section>

<div id="container">
    <header>

    <div id="appInformation">
      <a href="#" alt="Home">
        <img src="">
      </a>

      <span>Selected AppName</span>
    </div>

    <div>
        <span id="time">TIME GOES HERE</span>
    </div&g开发者_StackOverflow社区t;

    <div>
      <a href="#" alt="Additional Information">
        <img src=""><!-- This is will be the location of the the 'i'-->
      </a>
    </div>

    <div class="">
      <label>UserName</label>
    </div>  

    </header>
    <div id="main">
        <!-- main content for the selected app here -->
    </div>

    <footer>

        <div id="appVersion">
            VERSION # HERE
        </div>

        <nav>
            <ul>
                <li>
                    <a href="#">FAQ</a>
                </li>
            </ul>
        </nav>

        <div id="">
            <!-- Team logo here-->
        </div>

    </footer>

---

• Avoid unacessary Div.
• Use the Time Tag instead of Div for Time Element.

• Avoid Label if you don't have anything to refer too, like an input.

  Selected AppName

      <time datetime="YYYY-MM-DD">TIME GOES HERE</time><!--  Don't need an id Time since you can target the Time tag -->
  
      <a href="#" alt="Additional Information">
          <img src=""><!-- This is will be the location of the the 'i'-->
      </a>
  
      <em>UserName</em> <!-- Don't use a label if you got nothing to refer too, like an input for example. -->
  </header>
  <div id="main">
      <!-- main content for the selected app here -->
  </div>
  <footer>
      <div id="appVersion">
          VERSION # HERE
      </div>
      <nav>
          <ul>
              <li>
                  <a href="#">FAQ</a>
              </li>
          </ul>
      </nav>
  
      <a href="yourTeamUrl" id="">
          <!-- Team logo here-->
      </a>
  </footer>
  

---

In addition to @Simon Arnold's fine answer, I might also suggest that the <nav> usage is incorrect. A single link in a footer can hardly be construed as a "major navigation block". See the first note in green text at http://dev.w3.org/html5/spec/sections.html#the-nav-element