Simple Help With Some Script Stuff! Please Help Muh!

Hey guys, Im a super newb…and I have a super newb question!

If I want to put a google ad in my post, or any other type of script for that matter, like a small amazon item or something, how can I put them next to eachother, instead of just one on top of the other. Please visit https://yunzy.com/clothing to see what im talking about. You see how they are right on top of eachother, I just want them to be side by side, and they will fit, well, that leads me to my next question. I have increased the content size before, so that it took up much more room, but I cant figure it out on this theme. Here is the stuff I can edit in the theme editor.

body{
background:#fff url(./images/bg.png) repeat-x;
border-top:5px solid #333;
color:#555;
font-family: Georgia, “Times New Roman”, Times, serif;
font-size:62.5%;
line-height:1.5;
margin:0;
padding:0;
text-align:center;
}
#wrap{
margin:0 auto;
text-align:left;
width:76em;
}
#content{
font-size:1.2em;
float:left;
padding:1em;
width:40em;
}
#sidebar{
font-size:1.1em;
float:right;
padding-top:2em;
width:20em;
}
#header{
padding:3em 1em;
}
#footer{
background:#333;
border-top:1px solid #777;
color:#888;
clear:both;
font-size:0.9em;
padding:0.5em;
}
/*************************************
+Hn and p
*************************************/
h1, h2, h3{
font-family: Tahoma, Verdana, Arial, Helvetica, sans-serif;
font-weight:normal;
letter-spacing: -1px;
margin:0;
}
#header h1{
font-family: Georgia, “Times New Roman”, Times, serif;
font-size:3em;
margin:0;
margin-right:1em;
}
#header h1 a{
color:#E87830;
}
#header h1 a:hover{
color:#CC0000;
}
#header p{
color:#aaa;
font-size:1.1em;
margin:0;
margin-top:-0.5em;
}
.entrytitle h2{
font-size:2.2em;
}
.entrytitle h2 a
{
color:#B4C24B;
}
.entrytitle h2 a:hover{
color:#58BBEB;
}
.entrytitle h3{
font-size:1.8em;
color:#6F6F6F;
}
.spacing-fix{
display:none;
}
#sidebar h3{
color:#555;
font-size:1.5em;
margin:1em 0;
}
/*************************************
+Entry
*************************************/
.entry{
margin-bottom:3em;
}

.entrymeta{
font-size:0.9em;
}
.postedby{
background:#fff url(./images/user.gif) no-repeat;
padding:3px;
padding-left:20px;
}
.filedto{
background:#fff url(./images/post.gif) no-repeat;
padding:3px;
padding-left:20px;
}
.commentslink{
background:#fff url(./images/packaged.gif) no-repeat;
padding:3px;
padding-left:20px;
}

/*************************************
+Sidebar
*************************************/
#sidebar ul{
list-style-type:none;
margin:0;
padding:5;
}
#sidebar ul li{
border-bottom:1px dotted #ddd;
margin-bottom:0.3em;
padding:0.3em;
}
/*************************************
+Comments
*************************************/
.commentsblock{
margin:0.5em;
padding:1em;

}
.commentsblock textarea{
width:35em;
}
.commentsblock input, .commentsblock textarea{
border:1px solid #d1d1d1;
}
.commentsblock textarea:focus{
background:#eee;
border:1px solid #a1a1a1;
}
.commentsblock textarea:focus, .commentsblock input:focus{
background:#eee;
border:1px solid #a1a1a1;
}
.commentauthor{
display:block;
font-size:1.5em;
}
ol.commentlist{
color:#777;
font-size:0.9em;
list-style-type:none;
margin:0;
margin-top:1.5em;
padding:0;
}
.commentlist li{
margin-bottom:0.5em;
padding:0.5em 1em;
}
.alt{
background:#f3f5e9;
border:1px dotted #d1d1d1;
padding:0.5em;
}
h3#comments{
font-size:1.6em;
}

/*************************************
+Misc
*************************************/
a{
color:#579;
text-decoration:none;
}
a:hover{
color:#CC0000;
}