Learn HTML5 from Scratch
https://www.udemy.com/learn-html5-programming-from-scratch/

JavaScript will take up the most of your time so you will want a lot of resources. Well start with some tutorials.

Comprehensive JavaScript Programming
https://www.udemy.com/comprehensive-javascript-programming/?dtcode=gxL8I8E1f2c3

Learn to Code: The Full Beginners Guide
http://lifehacker.com/5744113/learn-to-code-the-full-beginners-guide

JavaScript Tutorials for the Beginner
http://www.homeandlearn.co.uk/JS/javascript.html

Eloquent JavaScript
http://eloquentjavascript.net/

You will want a reference to the built in JavaScript objects and methods as well as a list of HTML tags and CSS properties. You will want to learn how to use the developer tools built into your web browser.

Mozilla Developer Network
https://developer.mozilla.org/en-US/

Finally you can move onto game development. Here&rquo;s another free course.
https://www.udemy.com/free-prep-for-html5-game-development/?dtcode=50SH4291f2jb

You might want to dip into more advanced stuff after that.

JavaScript Design Patterns
http://addyosmani.com/resources/essentialjsdesignpatterns/book/

Learning JavaScript and jQuery from Scratch
https://www.udemy.com/learn-javascript-jquery-from-scratch/?dtcode=Ugn94de1f2qB

Phaser
http://phaser.io/

Oh, and you will want a code editor. Like Komodo Edit but there are others.

Komodo Edit
http://www.activestate.com/komodo-edit/downloads