1/ Under 'themes' in admin, select he applicable theme to edit or select 'get more themes' to start from scratch.

2/ Once you are in the theme editor, select "Home page" from the left column.

3/ This is where you can add as many 'custom HTML' snap-ins as you wish. They will make up the body of your index page. (edit the 'header' and 'footer' sections separately in the theme editor)

4/ You can cut the code out of dreamweaver and paste it into the custom HTML area of the snap in.  

You need to make sure you have uploaded your graphics - see ftp section - and make sure your links correctly match the location of your images etc.

Cheers