There are many game development softwares available for anyone interested in game development . Stencyl is just the place to start. Now i will give you a guide on how to develope your first game.
MY word: Before considering to start developing a game, it is good you learn abit of HTML5 so that you can perfect you work . However it is good to start somewhere.
Firstly, you need to download stency software at http://www.stencyl.com/
Install the software and create your first game as follows.
== Launch the application from your desktop
== click on create new game
== Check out sample games at http://www.stencyl.com/developers/samples/
== Download any of the games and go back to the stency software and click on Import .
== With this you can edit and try to add in your ideas
. That is it for your first game.
== As you get use to this, you can now try better ways like starting from scratch or using the kit.
Good luck in your game development adventure.