You probably want to go to the bookstore and buy some kind of “HTML for Dummies” book. Something that’s simple and talks about web page design.
In addition to that you’ll probably want to buy something like Dreamweaver.
https://www.macromedia.com/software/dreamweaver/
You can program web pages with nothing more than a simple text editing program, but that’s going to be a LOT harder. With Dreamweaver you’ll be able do a lot more a lot faster. Look for tutorial books on that program while you’re buying the HTML book, it can help you jump in a lot quicker to try out some lessons from a book instead of simply readnig the manual.
And I DO suggest getting the HTML book even if you’re going to buy a program that helps you design it. Even though the program is doing a lot of the work for you it helps if you have some understanding of what, exactly, it’s doing for you.