Hi cal girl!
I understand that some of the stuff in this forum can be pretty inimidating, but some of the stuff people are trying to do on here is pretty complicated.
That said, it does not have to be that hard. Dreamhost has an excellent selection of "one-click" installable programs for building/managing your website, that include a full-blown content management system (CMS) Joomla!, the popular WordPress blogging software (that many use as a site-builder, as it allows the creation of pages in addition to just blog entries), a full-featured shopping cart / ecommerce solution in zenCart, and more.
I can't give you any guidance regarding iweb, as I am only passingly familiar with it, but you may well find the "one-click" install will meet all your needs.
You might want to check out the Dreamhost Wiki, and explore around there a bit to see if any of that information is helpful. In particular, check out Building a Website and One -Click Installs.