Build Mobile App Educational Games

My goal is to release one fun, educational game app every month in a different subject. The key is to truly make it a fun experience for the user, while at the same time allowing them to learn a new concept or skill. The game needs to be easy to use, fun, intuitive, engaging and rewarding for people to play. It will take subjects normally considered mundane, complex or overwhelming by students (e.g., math, science, etc) and make it fun through unique aspects of game design. Down the road, games will be designed to improve players' skills in certain areas (e.g., communication - eye contact, languages, public speaking, etc). I am looking for someone who can create the design/story, build the source code, and upload the code to the 3 major mobile app stores (Apple, Google, Windows). I would be the sole owner of the rights of the app. Please give me your estimate on how much this project will cost and how long it will take to complete. Thank you.