Website changes for core PHP custom build website

I have custom PHP core website that needs following changes done. 1) Flashcard functionality to be added so user can practice flashcards as configured in DB through admin panel. 2) On Product page, user to be able to select combination of options (e.g. Videos + Questions + Support + Virtual Course etc...) and price should adjust automatically based on my configuration in Admin Panel. This will be done from a new page added as a new tabs under PRODUCTS menu item, one for each category. 3) A way for user to like FB, Twitter and LInkedIn PMCerty pages and get 5% discount added to the cart automatically. User should be able to do this from his account so that available discount will be available to him for one product purchase of his choice. And user should be able to have these discounts applied to same product or different products as per his choices made 4) Making Text and video based Testimonials sections available on pages like product detail, training schedule, forums, contact us etc... 5) When a message is unread in message board of the customer, there should be some symbol (like we get on mobile when something is unread yet) on My Account menu item and also My Account → My Message sub menu item, indicating new message is there in message board. 6) Issue with customer invoice page and DB retention of the actual price paid by customer. This needs to be fixed 7) Invoice email should have Invoice PDF attached. Admin -> Orders -> Edit an Order -> Send (Email should be received with perfect PDF with perfect layout). 8) Message board should have automatically have Product Usage Instruction Message after purchase + one invoice message after purchase with invoice PDF + One automatic message after a week of purchase for FB, LN, TW, YT page likes and recommendations 9) Process Assessment Tool - searchable ITTO in popup. + better fonts + wider popup window 10) Website loading speed improvement 11) Security Enhancements for DB connection optimization through PDO or similar. 12) Making smart devices having perfectly responses pages. Currently the pages are bad formatted. We can decide what to keep and what to remove for smart devices and how to layout for smart devices. 13) Broken Author Links in List of Authors on Right side Panel 14) Timers to be corrected. (Training schedule page, Product Detail page for online and onsite classroom trainings, Training start and joining timers from within user/moderator accounts) 15) User should get automatic message in his message board with Training Certificate automatically created in PDF format for each student of the batch. Let me know your fixed price quote in AUD.