Modifications for magento site -- 2

1. Solving RTL invoice pdf 2. Implementing ZATCA QR barcode to the invoices for Saudi Arabia regulations 3. Guidance on social login for Facebook, Twitter, Gmail and etc 4. Implementing best practice for email templates like ads, offers, orders (confirming, payment, cancelling), info update, password and etc 5. Guidance and best practice on SEO and google analytics 6. Beautify checkout page like amesty for example with auto-detect location to fill up address fields 7. We've API in both site and ERP and we need some help 8. Optimizing and speeding up the site in every possible way 9. Integrate sms with local company so it can be used for login, orders, ads and etc 10. Guidence to implement sell up, cross up and similar items 11. In home page: showing best selling items and new items automatically. Also, how to make an item appear as new for specific period of time starting from the time being added. 12. Scheduled backup to ftp storage, automatic corns for caching and reindexing 13. Is the most important part where all implementation and solution should be documented so it can be used as a reference for my own knowledge since I have more than 1 site to manage. Because I will make the same changes by myself on the other site, otherwise I would need some help and guidance