How to create a template for a static homepage

Hi everyone.

I am relatively new to all this and apologise for any idiotic questions.

I am currently building a website for someone and I want to create a homepage that is differently templated from the rest of the site. I would like one giant image with the menu bar above it. No sidebars or anything like. This is the page I would like to change http://michaeljbaker.co.uk/ and this is an ex. that shows what I basically would like to achieve. http://www.landsecurities.com/

Many thanks for any help anyone can give me.