HTML Website template Editing

I have a website template to view it go to : [login to view URL] I wanted to edit the template here are the changes needed to be done: 1. Clear 'products' page of all images and text then, Add gallery to page , this gallery should be smart and zoom on a photo when clicked and background darken. there should be a next and previous button on the top corner of each photo. Also the products button will read 'Portfolio' instead. Here is a example website which has the type of gallery I want: [login to view URL] I also want 4 subsections, similar to the example website : (Logos, Magazine Ads, Publicity, other) When clicking on each subsection title the new gallery will open on the same page, just like the example website. The main portfolio page will just have a logo and some text. 2. Change 'about us' button to 'About' 3. The home page will be different to what is currently there now, I wanted to get rid of all images and text and just have a large logo which i have the image file for , also where it reads 'business worldwide solution' next to the buttons , I wanted my own logo also placed in there. Basically 2 logos to be placed on that page and what is currently there needs to be deleted. 4. 'Contact Us' page is quite easy , just to clear everything in there now and just add a contact email address. 5. Most importantly create an admin section for this website, so i can add and delete photos and also change the order they appear in and select which subsection the images should go into , also edit the 'about' page text edit the 'services' (text) page and edit the 'contact us' page. I want to be able to have the following things editable also in the admin section: -change font size of text - change text colour - change font 6. Change some colours such as the buttons , background and borders. I'm happy to extend the deadline by a few days if you need extra time. This website should work on all platforms Mac and PC also all browsers.