OSCommerce Creloaded template edit & install + newsletter integration

I have creloaded 6.2 installed. I have bought a new template for it and I need it installed, but first I need the colour scheme changed. The PSD files are included with the template. I also need the newsletter checkbox to add new registered customers to my listmessenger script instead of the creloaded newsletter. I already have this working on another site so if you tell me which files would have been hacked I can send them to you. Lastly, I need my logo re-done. I have it only as a flat image (scanned from a flyer) and will need it to be copied & produced as a layered psd file.