A website's layout is almost as important as the content that's chosen, because the layout of the site determines how easily it's navigated. You've probably noticed that there are layouts that are more easy to use than others, and ones that take longer to navigate than they do to point you toward the right information. Easy-to-use sites are exponentially more likely to get repeat traffic, and simple layouts are more easy to create.
There are a lot of things that make up website design, with the actual layout being the most noticeable. How is the site organized, and where are items located? Does it have all the attributes that you would like to include on your site? Each page on a site can have a distinct layout; just because they are all part of a single site doesn't mean they all have to look the same.
Your site can be presented in much the same manner as a scrapbook, but instead of pages that show differences, websites have links to different categories. Whether you choose designs that are similar or different depends on your taste, and your level of web design skill. Before using a site building tool, check to see whether it supports multiple layouts. The layout also depends on what you're offering; if your site is primarily text, you'll need a different layout than if you had a lot of pictures.
Adding more space is easy, but the work can be cut to a minimum by using a good layout. Make sure that the background colors make text easy to read; choose the color of the text carefully so that it's easy on the eyes. Text that's too hard to read will drive people away from your site.