Hope my advice will help you ,
1. First open your code editor ( mine is dreamweaver ) and just open a new file .
2. Then do a coding as follow ;
Template Name: freyaluna_page
3. Above is the basic structure for a custom page . After saving the file inside your theme's directory ( ex. twentyEleven/freyaluna_page.php ) , you will see a drop down menu in 'ADD A NEW PAGE' page's right side bar . And you will find this newly created freyaluna_page is listed . So just select it, and make it the page template for your needed page or pages .
4. But, here just putting this code will just give you a page most probably with header content and footer ( not including all ). So you have to code as you want the page to be . For an example, if you want a photo gallery to be loaded inside this custom made page, you will have to call that photogallery script inside this freyaluna_page.php . The code should be put in between the header and footer , see below ,
YOUR PHOTO GALLERY SCRIPT SHOULD BE WRITTEN HERE
Hope this will be helpful .