Yes honestly mate stick with iweb templates.
But I feel like you want more, so why not learning CSS ? You would get total freedom on design... All you need is a text editor. Text Wrangler is free and great.
What I reckon is not to start from scratch as you are a beginner but either to choose a template from
http://www.freecsstemplates.org/ and customize it. One day you will feel ready to start your own one.
Believe me it's 10x less frustrating than working with iWeb. iWeb is good to throw a quick photo blog but not to build a refined website on my opinion.