Html + CSS

Front-end
#1

Pessoal, iniciei o trabalho visual e não tenho certeza se estou colocando no lugar certo… se não estiver favor encaminhar pro local adequado.

Possui os seguintes codigos:

index.html

[code]

Documento sem título 
<body>
    <br>
    <div id="tudo">
        <div id="menu">
            <ul class="nav">
                <li><a href="http://www.google.com.br">Goo</a></li>
                <li><a href="#">Link 2</a>
                    <ul class="submenu">
                        <li><a href="#">Submenu 1</a></li>
                        <li><a href="#">Submenu 2</a>
                            <ul class="submenu-2">
                                <li><a href="#">Submenu 2.1</a></li>
                                <li><a href="#">Submenu 2.2</a></li>
                            </ul>
                        </li>
                        <li><a href="#">Submenu 3</a></li>
                    </ul>
                </li>
                <li><a href="#">Link 3</a></li>
                <li><a href="#">Link 4</a>
                    <ul class="submenu">
                        <li><a href="#">Submenu 1</a></li>
                        <li><a href="#">Submenu 2</a></li>
                        <li><a href="#">Submenu 3</a></li>
                        <li><a href="#">Submenu 4</a></li>
                        <li><a href="#">Submenu 5</a></li>
                    </ul>
                </li>
                <li><a href="#">Link 5</a></li>
            </ul>
        </div>
        <div id="conteudo">
            <p>&nbsp;</p>
            <p>Conteudo aqui!! </p>
            
        </div>
    </div>
</body>
[/code]

arquivo.css

[code]@charset “utf-8”;
/* CSS Document */

*{
margin: 0;
padding: 0;
}

#tudo{
width: 900px;
margin: 0 auto;
}

#conteudo{
height: 400px;
background: #CCCCFF;
}

#menu{
height: 30px;
}

.nav{
list-style: none;
font: 15px “Trebuchet MS”, Arial, Helvetica, sans-serif;

}

.nav li{
float: left;
position: relative;
}

.nav li a:link,
.nav li a:visited{
display: block;
padding: 5px;
border-left: 10px #999999 solid;
background: #cccccc;
text-decoration: none;
width: 160px;
color: #000000;
}

.nav li:hover a,
.nav li a:active,
.nav li a:hover{
display: block;
padding: 5px;
border-left: 10px #ffd200 solid;
background: #999999;
text-decoration: none;
width: 160px;
color: #ffd200;
font-weight: bold;
}

.submenu{
margin:0;
list-style:none;
display:none;
width:146px;
position:absolute;
top:30px;
}

.nav li:hover .submenu{
display:block;
}

.submenu li a:link,
.submenu li a:visited{
display: block;
padding: 5px;
border-left: 10px #FFD200 solid;
background: #cccccc;
text-decoration: none;
width: 160px;
color: #000000;
}

.submenu li:hover a,
.submenu li a:active,
.submenu li a:hover{
display: block;
padding: 5px;
border-left: 10px #999999 solid;
background: #ffd200;
text-decoration: none;
width: 160px;
color: #000000;
font-weight: bold;
}

.submenu-2{
margin:0;
list-style:none;
display:none;
width:130px;
position:absolute;
left: 180px;
top: 0;
}

.nav .submenu li:hover .submenu-2{
display:block;
}

.submenu-2 li a:link,
.submenu-2 li a:visited{
display: block;
padding: 5px;
border-left: 10px #FFD200 solid;
background: #cccccc;
text-decoration: none;
width: 160px;
color: #000000;
}

.submenu-2 li:hover a,
.submenu-2 li a:active,
.submenu-2 li a:hover{
display: block;
padding: 5px;
border-left: 10px #999999 solid;
background: #ffd200;
text-decoration: none;
width: 160px;
color: #000000;
font-weight: bold;
}[/code]

não estou conseguindo colocar a pagina do google por exemplo dento do id=conteudo, isso é possível? ou vou ter que fazer o que?

#2