I second this because i'm guessing that you either have none or beginner skills in graphic design. So you may be restricted to what you can create due to your limitations of the knowledge of the software(Photoshop ect.).start it from manual art(drawing/sketching) in this way you can start the rough ideas of your mind on paper and then comes to learn the digital part.
for that firstly you should know about html,css,javascript and photoshop/coreldraw.