Design subscription pages

Hello, I'm about to launch a language exchange community website for students from 10 to 18 y/o. Students can subscribe to to get more activities. Now i need to design the promotion pages of the site - the homepage banner - the block to subscribe - the page to present what you can get if you subscribe. You can see what I have already done on the screenshot. But i need something more professional. I need this design and also if you can advice about the process to sell more efficiently the subscription. About the website : - You can register as student or as teacher - Teacher can create classes, create QUIZ, and find other classes to start language exchanges between the classes. Everything is for free for teachers. They don't need to subscribe, only to register for free. - Students can register for free, join their class (created by teacher), play QUIZ, and if they subscribe to the CLUB, they will be able to have penpals and to participate to competitions (based on QUIZ). I have attached some files to give you more materials. Thank you