I've been looking into this for about 4 days now and I'm lost!

I want to remove the login page and invoke COWOA but move the billing info and payment details sections of checkout below the shopping cart. My products are all free shipping as well so I don't need the shipping selection module either (which still appears even though I have set up products to free shipping always).

Has anyone got any ideas how I might accomplish this? or can you point me in the direction of the files/templates so I can edit.

LINK TO MY SITE

Many thanks
Alan