Upload & Rebrand Existing Webapp

I already have the full source files and hosting credentials ready to go. Your first task is to upload the current site/web-app to the live server without disrupting any existing functionality. Right after the site is live, I need the visual layer refreshed... (Budget: $20000 - $50000 USD, Jobs: Branding, CSS, HTML, JavaScript, Web Design, Web Development, Website Management, Website Optimization)