Full Width and Sidebar

Hello,
I bought a custom theme and am working on customizing it. I have actually done all the stuff myself and am getting little to no help on one final change. I have had people tell me that on their computers the content area looks to small. I have tried widening it, but in doing so, it gets rid of the side bar. In the CSS file it says max 1050px I am not sure if this is where things would be changed. I am not really understanding the widths/padding/percentages. Please be kind and don’t tell me to not mess with it. I have been trying to learn things on my own and have gotten this far. Basically I want my blog to be a full width layout with a sidebar in it. The theme has different layout options…just not that specific one. There is a full width one and then obviously ones with sidebars.

This is what the dimensions are according to the CSS file. `/* ## Column Widths and Positions
——————————————— */

/* ### Wrapping div for .content and .sidebar-primary */

.content-sidebar-sidebar .content-sidebar-wrap,
.sidebar-content-sidebar .content-sidebar-wrap,
.sidebar-sidebar-content .content-sidebar-wrap {
width: 980px;
}

.content-sidebar-sidebar .content-sidebar-wrap {
float: right;
}

.sidebar-content-sidebar .content-sidebar-wrap,
.sidebar-sidebar-content .content-sidebar-wrap {
float: left;
}

/* ### Content */

.content {
border: 2px solid #000;

float: left;
width: 72%;
text-align: left;

}

.content-sidebar .content,
.content-sidebar-sidebar .content,
.sidebar-content-sidebar .content {
float: left;
}

.content-sidebar-sidebar .content,
.sidebar-content-sidebar .content,
.sidebar-sidebar-content .content {
width: 580px;
}

.full-width-content .content {
width: 100%;
}

/* ### Primary Sidebar */

.sidebar-primary {
float: right;
width: 25%;
padding-left: 0px;
border-left: 1px solid #eee;
border: 2px solid #000;

If anyone could be so kind to point me in the right direction I would really appreciate it. Is it even possible to achieve this in this theme? If not, I am looking for a free or very inexpensive theme instead. I am getting frustrated at this point because I am so close to achieving what I want. Thank you!

Shawna