How Can I Style My Menu With…

Im very new to WordPress and i dont know a great deal on how to do stuff and still learning but ive became stuck on how i can use this style

/* Menu Style */
.menu {
	display:block;
	width:auto;
	height:41px;
	list-style:inside none;
	padding:0;
	margin:0;
	border:1px solid;
}
.menu li {
	list-style:inside none;
	padding:0;
	margin:0;
	display:block;
	position:relative;
}
.menu li a {
	outline:none;
	display:block;
	margin:0;
	padding:13px 15px;
	font:bold 11px 'Carme', sans-serif;
	text-decoration:none;
	border-left:1px solid transparent;
	border-right:1px solid transparent;
}
.drop {
	position:relative;
	z-index:2;
}
.menu li:hover a.drop {
	color:#000;
	background:#fff;
	border:1px solid #000;
	border-bottom:0 none;
	margin-top:-1px;
	padding-bottom:14px;
}
.menu ul {
	display:none;
	position:absolute;
	min-width:180px;
	list-style:inside none;
	margin:0;
	margin-top:39px;
	padding:10px 0px;
	background:#fff;
	border:1px solid #000;
	z-index:1;
}
.menu ul li {
	margin:0;
	padding:0;
	list-style:inside none;
	border:0 none;
	float:none;
}
.menu ul li a {
	float:none;
	padding:6px;
	font-weight:normal;
	color:#777;
	border:0 none;
	border-bottom:1px solid #eee;
	border-top:1px solid transparent;
}
.menu ul li:last-child a {
	border-bottom:1px solid transparent;
}
.menu ul li a:hover {
	border:0 none;
	border-top:1px solid;
	border-bottom:1px solid;
}
.menu ul a {
	white-space:nowrap;
}
.menu li ul {
	display:none;
}
.menu li:hover > ul {
	display:block;
}
.dropdown-box {
	display:none;
	position:absolute;
	width:auto;
	margin:0;
	margin-top:39px;
	padding:10px;
	background:#fff;
	border:1px solid #000;
	z-index:1;
}
.dropdown-box p {
	font:11px/140% 'Carme', sans-serif;
	color:#777;
	text-align:justify;
	margin:0;
}
.menu li:hover > .dropdown-box {
	display:block;
}
/* Align styles */

.left li {
	float:left;
}
.left li a {
	float:left;
}
.left li:hover a.drop {
	margin-left:-1px;
	padding-left:16px;
}
.left ul, .left .dropdown-box {
	left:-1px;
}
/* Color styles */

.black {
	background-color:#333;
	border-color:#000;
}
.black li a {
	color:#fff;
}
.black li a:hover {
	background-color:#444;
	color:#fff;
}
.black ul li a:hover {
	background-color:#333;
	border-top-color:#000;
	border-bottom-color:#000;
}

the menu thing im using to show where i want it on my layout is…

<?php wp_nav_menu( array( 'sort_column' => 'menu_order', 'container_class' => 'menu-header' ) ); ?>

thanks,
Renny