The simplest way to create an additional web page is to save a copy of an existing web page file under a new name, then change its text and ../images to reflect what you want in your new page. When you make a duplicate of one page, the duplicate page will already have the layout, color scheme, fonts, etc. that the rest of your web pages have - you need only delete items that you don't want in this new page, and add items that you do want.
If you are working with the source code only of your web pages:
Open an existing content page, content1.html, for example, in a text editor like Notepad or Wordpad.
File>Save As, and give it the filename content2.html
Be sure to save it in the same folder as the original file.
Then, in the html source code, delete/replace the old content with new content.
If you are working in an HTML editing program:
Open content1.html in the program of your choice, such as Dreamweaver or FrontPage
File > Save As, and give it a new filename, such as content2.html
Be sure to save it in the same folder as the rest of your web page files.
Delete any items (../images, text, etc.) you don't need in the new page, and put in new content.
Or, working from Windows Explorer, you may copy and paste an .html file, and rename the pasted file with the name for your additional page. For example, right-click on content1.html, copy, paste. Then right-click on "Copy of content1.html" and rename it content2.html.